Be accurate with your information when signing up! Input your name EXACTLY how it appears on whatever identification documentation you will be using to verify (most commonly drivers license). Example: if you go by 'Joe' but your license says 'Joseph', make sure to register as 'Joseph'! Most of the more reputable sites won't fuss over this, but others might. If you enter the wrong info, change it yourself if it lets you edit your profile, or contact customer support BEFORE you deposit or need to redeem money. Do NOT create multiple accounts or do anything that could be interpreted as fraudulent - this can result in disqualification from redeeming winnings. Follow the rules, and you should have no issues.
Verify Early:
I suggest getting verified before depositing any money! While I've never had trouble verifying after a win, getting it done beforehand could save a headache and anxiety down the road if a casino gives you trouble with your verification. You don't want a redemption withheld because your license says Susan but your Bank Statement lists you as Sue! Clear this up before it becomes a problem! Also, input a redemption method early to ensure you don't run into trouble with that either. Note - some casinos don't like online banks like Robinhood, for withdrawals. Some are fine with it, it doesn't hurt to try, but have a checking out with a traditional bank available to save headache.