Ahh, you learn fast grasshopper.... :lol:
Yep, you got it exactly right. A lot of us do exactly that. Reserve the room at room only, you will be required to pay them a small fee to do this, sometimes up to the cost of one nights stay.
Then follow the boards, forums, MouseSaver, etc for the codes. When they come out, call them back with the code and you res. number, and they will re-reserve under the code, and then you can apply what you've paid to the new reservation.
This makes sure you will get the room you want, and it wont get sold out while you are waiting for codes to come out.
But NOTE the following...
Take note of when they tell you you have to pay for the room in full, and when the cancellation policies are for the room only reservation. The last this you want is to find out later that either the codes are not as good as you hoped (or no codes at all for your time period), and you get stuck in a cancelation clause that makes you loose some (or all) of your down payment.
Check out this MouseSavers page, it list when codes in the past have been released. This is by no means exact for this/next year. But is a good guide to start by.
MouseSavers Historical Codes
Hope this helps! :wave: