Well, the faster your bacteria get going the faster the cycle can start and end. If you want it to go quickly, sure use a generous amt of water. If you really want to get it started well though, you should borrow some gravel from a friend's tank. You can do one of two things:
1. Just take some gravel which has algae and bacteria living on it and litter it on the gravel you have already.
2. If you don’t want to mix the two gravels (or you want to return your friends) you can take a woman's nylon and fill it with a cup or so of your friend's gravel, tie it off, and just set it on the bottom.
In either case, wait for your ammonia, nitrate and nitrite to spike and then return to zero, over the course of at least a week. This is how you know your tank has cycled.