toos, as far as what saber to get first, it all depends on your own personal preferences. But for a first saber, you can't go wrong with one of the newer sabers- Anakin ROTS, Vader ESB, Luke ROTJ, and Mace ROTS. Go with whichever saber hilt or blade color you like the most, and before you know it, you'll want to collect them all. ;D
About the pictures, when you post a message, use the second button from the left in the second row of buttons (above the row of smileys). If you want to include a picture, you'll need a website link to that picture. So you can either refer to pictures other people have online, or you'll need somewhere to host your images (photobucket seems to be quite popular here).
Hope this helps. And in case no one's said it yet (small chance, I'm sure), welcome to the boards! :)