DetroitJunkie may be able to give you some more US-specific advice (assuming you're in the US?).
I'm in Australia and the training here is 100% on the job. A lot of what you need to learn is mechanical, as in shuffling, card handling, pitching, chip handling, etc. There's some YouTube videos that could get you a head start on that, though it's probably worth double checking what method your card room uses so you aren't practicing the wrong one (for example at my local casino the dealers pitch, but in the next state over they deal out of a shoe... which is pretty much the worst thing ever).
The other thing is just being very familiar with the rules of the game. The card room should have its rule book available publicly, so reading that will definitely be a good idea.
Oh - and one other thing you can practice yourself is working out split pots. Practice the "nightmare scenario" which is a full table of players, all with different size chip stacks, all going all in. Put out nine random piles of chips and then work out ALL of the side pots. You'll almost never have to deal with a situation like that in real life dealing, but if you can handle that, you should have a pretty easy time dealing with the much more common one, two or three side pot situations.
