Welcome to RC!!! Last year was my first frag swap and I can almost guarentee that you'll love it.
If you want specifics on what you should try, you might want to post about your set-up (probably most importantly what lighting you are using). Most leathers and mushrooms make good beginner corals. A lot of people start with xenia and a lot of people recommend green star polyps for newbies. Just be careful on placing either of those because sometimes they can grow so fast that they actually become a menace. I don't know if you have the lighting and the filtration for SPS. If you do, I was a newbie at last years swap (with plenty still to learn now) and have had the best luck with bird's nest (I'll have probably 12-13 frags of this since it has quadrupled in size in the last six months), montipora digitata, and monti "caps."