One thing you will want to think about when you are looking at all of the different options that are out there in regards to what to do when you are at a casino is the making of a deposit onto a card. This will then allow you to keep track of what you are spending, and ensure you do not spend too much while you are there.
Essentially what you are looking to do is get a card that is much like a hotel key for casinos that you will be able to put money on and it will allow you to able to go play and enjoy all of the amenities of the hotel without needing to use cash or having to worry about if you have your wallet. You will simply need that card and then you will be able to go and use all that the casino has to offer and not have to worry about anything else.
Parting Ways
That is one way to look at what you will be doing with your money when you go to the online casinos and put money into your account so you are able to play and enjoy all that the casino has to offer to you as a player and as 
someone who is a patron to the casino.
In many cases the money you put into the account is turned into credits so you will then not envision it so much as money but as opportunities to win money when you are playing. By using this method, it creates the illusion of you not losing as much money as you are because you do not see it as dollars and cents until it is all gone.
So, pay attention to how much you have and how much you will put in before you go and make a new deposit into your account when you are budgeting out for the month and for your entertainment purposes.