Best way to start an online poker bankroll?

To start a bankroll, if you don't have money to make a deposit, I suggest playing only the freerolls, now if you have money to deposit, deposit a not so high amount and play low limits so you can adapt, and as for the site, I think this will From person to person, take a look at the most famous sites and see which one you like the most because the site that is best for me may not be for you