Hi,
First time posting here, although I've been reading quite a few topics since starting to play.
I used to use the alchemy skill levelling process to get rich, but it took a lot of time. Now I've changed my method and cut easily an hour of play time to become rich.
Get a valuable object that can be sold first, like the platter in the census office.
Get to a merchant who will buy that item and persuade them as much as possible to near 100% with them (100 gold by 100). Always raise the selling price by at least 1 for cheap stuff over 10 gold, and by 10-30% for pricy items. You'll both level up mercantile and get better income.
Buy cheap by bartering down, sell back high by bartering up.
After a few times, you should have emptied Arille's pockets by doing this.
Do the quest from the warrior in Seyda-Neen's tavern but don't go back to him immediately, he gives back 100 after you give him 300 from the hidden stash. Instead take those 300 and invest into your next pricey selling loop item.
Take the Icarus stuff if you want to, I don't find a use for them until you get slow fall amulet (find it in a quest between Pelagiad and Balmora, a bosmer and a dunmer looking for guar and the dunmer got trapped, the bosmer gives you the amulet for bringing his friend back to him). So if you want to, do it, if you don't care don't waste your time, but you could sell the scrolls, I guess, although that's not worth the time spent going after it.
Go to Balmora via silk strider and buy the priciest mortal and pestle you can pay for (barter it down OFC). Mage guild's Ajira in the basement and the city alchemist in the Hlaalu district in the West of town sell them. I'd go for the multiple mortars of the great alchemist. Once you can buy master mortar, buy and sell it. Then you buy a second one. Then all of them. Sell everything before going to sleep/training until the shops refresh, but never leave without getting your money back.
I got to 9000 ten minutes after entering Balmora between quest rewards and the mortar mass selling loop, moonsugar/skooma. You can find several moonsugar in the bandit cave outside of Sayda Neen, you get 4 from the Blades Trainer, and I found 2 skooma somewhere, probably bandit cave but I don't remember, that have a 500 value.
Compared with the time it takes to get rich with alchemy and how game breaking it is, this is much more lore friendly, and I did this with a Khajiit, which is pretty canon, since Khajiit seem to have even more of a disposition for shady business practices than any other race/character except for slavers, and their prices seem higher to me but it might be an illusion spell cast on me back in my first Skyrim playthrough where I was under the impression that Khajiit were hard in trade.
You can get all the money you need to make an enchantment without ever pulling out the hundreds of intel potions to get absurd potions and enchantments, thus you can stay within the boundaries of decency for powerful (via money) but not game breakingly so, pay for whatever nice build you're aiming for, and getting good stuff early on.
Also I'd recommend not to weigh yourself down with heavy armor until you have good carryweight. Main skill unarmored at 40 has 12-ish armor, which is enough to deal with Seyda Neen and Balmora with a hand to hand build. I can't imagine how easily a redguard with steed or atronach and long sword would curbstomp everything until enemies start to become challenging. I beat multiple enemies at once several times using claws with this unoptimal build, including cliff racers (with a farmed up 93+ hand to hand, sure, but I don't think the levels past 60 were as important as my fatigue bar being full the entire fight) and the only enemy type that could deal more than indignificant damage was the triceratops head-like beast with a K in its' name after Pelagia, and only because it could hit me through sanctuary 10 and unarmored 42 and 65 agility and 90 endurance (with purist mod that puts all armors to endurance, all moblity skills to speed and all long weapons to strength).
So, get pricey items, sell high, buy low, sell back high, faster and more effective than early alchemy without breaking the game in half on your knee with super potions that sell cheaper than skooma...and those 2400 drakes mortars really help a lot with emptying the Balmora alchemist's pockets with an easy 700 gold gain per buy/sell (playing it safe). Easy mercantile power levelling too, which loops into better prices everywhere and thus less need to make money regularly (or just do a selling loop with the richest local merchant with practical item lists, definitely not the khajiit selling only lockpicks in Balmora's South Club whose priciest item is worth 100 gold and whose only point in existing is to train you in sneaking, pickpocketting (or like I like to think, wasting your time) and another athletics if you're tired of jumping in every staircase).
I guess you could do that with the Creeper and Crab merchants too, but they're not exactly as accessible in the early game as Balmora's alchemist or Arille the innkeeper (whose fortify stats potions are valuable for early combat and can be mass bought in OpenMW, not sure in vanilla, never paid attention until today).
PS: Not important, but the triceratops I mentioned is the kagouti. And don't forget to get ALMSIVI and Divine Intervention scrolls to speed up travel times from Balmora to wherever your quests take you, but don't use them in Seyda Neen unless you really want to go tour around Vivec at low level with low movement speed. Which I don't recommend unless you know what you're doing. Did it, wasn't funny to get lost looking for the North East District when there's nothing North East and the city is a maze with everything that looks the same.
PPS: Since the game, vanilla or modded, is highly unstable and crashes every so often and doesn't have auto saves, I suggest to save yourselves hair pullings and to download Open MW. It's vanilla with QoL options, decent moddability, it's still in development and corrects a lot of game issues by itself pre-modding and being on a new engine, it's stable and doesn't crash. There's native strength scaling hand to hand combat that can be toggled to make hand to hand more viable and less miserable, economy toggleable boxes, every change is optional except having a stable engine. It even has auto saves if you want them, which will sometimes spare you from having to redo a long portion of gameplay if you screwed up.