If you wish to play with a real account and get those bonuses you'll need a way to fund you casino account. The 2 best ways are neteller and credit card. Some casinos accept a lot of ways to deposit money in your account, these are the 3 methods that are most commonly used for playing at online casinos.
The good things about credit cards are that you can fund your account straight away and start playing. The big disadvantage is the fact that some banks decline all gambling transactions. You’re also tempted to play with money you don't have.
This is by far the best way to bank online. All casinos accept neteller, and even better most will give you a bonus just for using it. There are plenty of ways to fund your account, easy to withdraw money using their debit card or their free wire transfers. You will need to verify you account with them.
Firepay is usually used by US and Canadian residents.