Need some advice

I posted before that I am new to the DL world, and so far I'm loving it, but I have some questions, if I pee a diapee, how long should I wait before I change it? say I am barely asleep and I pee, should I change before I sleep the rest of the night? also, where may I find either Abena m4's or Dry 24/7's for the best deal? I don't have a lot to spend at one time, but want to buy more, and get my moneys worth, what is my best option? Thanks for the help :3

Need some advice