for inserts, I usually use terry and flannel (from joanns or walmart, Hancock has some cute flannel prints too). But you can use lots of other fabrics also, like Velour.
And for wipes, pretty much any fabric you want. The ones I made for Val were microsuede on one side and plain cotton on the other. But anything works. You just want something that will absorb some water/solution.
Any other questions?

I'm happy to help!
Congrats on getting DH on board! That seems to be one of the harder things to do