When you open an account with an online gambling website, you will have a cashier account attached to your name. The cashier functions much like an online bank account. You will be able to deposit funds into this online cashier by credit card, echeck, bank wire, or a cash deposit at some of the land casinos. Then you can play, bet, and wager your funds as you see fit.
There are several cashout options from most online casinos. Checks by mail, bank wires, and ewallets are the most common ways to request a cashout. Typically sites take 1-2 days to approve a cashout and then another 3-5 business days to deliver the funds. Again the process works much like other online funds transfers.