go to you user control panel and on the left side, look for edit signiture and you can add a sig there. as for the pic you would have to up load it offside, I think most ppl here use tinypic, I've never heard of it till I came here so I don't know much about it, Photobucket should work as well, then you can get the img code and past that in your sig.
Hope that helps
Levi