I made some flannel wipes myself with a borrowed serger. You just buzz around the edges. They are 8x8 or thereabouts. Some of mine are 2-layer, some are 1-layer. The 1-layers are not lasting so well but dry really quickly.
I would say get a lot! At least 3 per diaper. Afterwards you can use them for other things.
For wipe solution, I use a squirt of baby wash, a squirt of aloe, a squirt of olive oil, a drop of lavender, and the rest tap water. About 1.5cups altogether. This is fairly concentrated because I hate the idea of it going yucky.
I keep this sauce in a squirt bottle near the kitchen sink. I moisten the wipes with plain water and then squirt on some solution. Then I put the wipes in the microwave for a few seconds. I change in the livingroom and our house is small so this works well for us.
Cloth wipes are so wonderful that I give a short stack of pretty ones as a baby gift. They are useful to anyone, even a "throwaway mom"