You have to memorize the perfect strategy for the game and then memorize a counting strategy and learn it to perfection. Altogether the learning aspect will take 100-200 hours I would say. Depends on the person and how dedicated you are.
As for profitability: you need cash to make cash, but It seems like you already have a bankroll ready to invest. 10k is pretty much the bare minimum for the work/reward ratio to be worth it. It’s about 20-30 an hour with less than 5% risk with that BR. If you scale that to 100k with the same risk it would be 200-300 an hour, so you can see how important maintaining and growing your BR is.
It’s a huge grind and I wouldn’t recommend hopping into it as your full time job until you establish your skills and have a proven track record. 200-300 hours of live casino play is generally enough to determine if your results are where they should be.
Side note: as you probably know the casino will kick you out if they know what you’re doing and could trespass you from their property, but if you don’t mind the adversity/heat from the casino, go for it. It really is a ton of fun and I’ve learned a lot about math/stats/money management that are very applicable in other areas of my life.