For prepping, you can also boil the diapers for about 12 minutes to save a ton on water bills (I boil, rinse, boil one more time then dry on hot. They aren't completely prepped at that point, but you can start using them without a problem. They continue to quilt up with subsequent washes).
Even though the wetness seeps through after one pee, the prefolds will hold a decent amount. Karen has a great tutorial about cloth diapering on the Green Mountain Diaper website.
My son is a pee-pot deluxe. At night I put him in a prefold with two hemp doublers with a wool cover, and that keeps him dry until morning, so the prefolds are more absorbent than they seem. Good luck!
I'm Kim... Coloradoan, nursing student, and devoted Momma to miracle baby Samuel (August 11, 2009)