Quote from ScalperJoe:
The amount of capital required and profit split will vary by firm. You also get to lever up your capital at a greater rate than a standard retail account. The best way to learn at a prop firm is by watching how other successful traders interpret the charts, and then by implementing a strategy that suits your personality and style.
Unlike a retail account, the funds you place at a prop firm are NOT insured by SIPC, so if you have a "decent amount of funds, 100k+" then you can decide what portion of that amount you feel should be at risk.