Anonymous bitcoin casinos usually have the same procedures for players to start gambling. Firstly, you need to create an account, usually using only your email. There are platforms in which it is possible to omit this part and go directly to the second one, which is depositing your funds. You need to use cryptocurrency both for depositing and withdrawing. Sometimes you can use Trustly instead of using crypto coins. But it is available only in Denmark, Estonia, Finland, Italy, Norway, Poland, Spain, and Sweden.
The rest is the same as with regular online casinos.