1) photoshop CS4 is the easiest one for a first timer, i used to hate photoshop, CS4 came out and i cant get enough of it.
2) see if you can click this link http://www.floridajeepers.net/viewto...e+posting+help
its a walk through i made for posting pictures. it should help.
3) to include it in you sig.
go to User CP, on the left find and click "Edit Signature". next you can insert it in the open text field, or add it with the uploader below.
hope this helps, if you need more just ask.