I just got my stash started from
http://www.diaperware.com. She had good reviews on MDC and she had a pretty comprehensive newborn diapering guide, describing the different types of dipes and a recommended list of supplies to have on hand.
Since this is the first time I'm trying this, I bought a bunch of varieties to experiment with once the baby gets here. (Slightly OT: does anybody else think it's tough to shop for a person whose size is a total mystery and won't really be known until he/she gets here?!?

) She's also fairly local to me, so I like not having to wait very long for a shipment.
As far as washing the prefolds, I started over the weekend, but had to stop because I felt guilty using unnecessary electricity these past few days due to the heat. I'll start back up again later on in the week. My plan is to wash 3 double-wash sets (wash cycle with detergent, wash cycle w/o detergent, dry). After only one set so far, I'm starting to see some quilting already.