Have you ever opened a casino account, deposited, and only then discovered that the bonus waiting for you was not the one you would have picked? It happens constantly, and it is the reason our sequence runs the other way round.
You choose the welcome offer before depositing, not after. The selection screen appears during registration itself, and what you pick there shapes everything that follows. It is a small structural difference with a large practical effect: nobody ends up with a slots-heavy package when they only ever play blackjack.
The rest is quick. A few minutes, one form, an email confirmation. No documents are needed at this stage and no manual approval stands between you and the lobby. If you simply want to look around first, you can.
This page covers the whole route: opening the account, what to do when login misbehaves, when verification becomes necessary and why handling it early saves considerable frustration later.