Bobby,
Could I suggest you start with this 'Junk Rig for Beginners' ?
I once made a junkrig for a dinghy, and found that it worked brilliantly well. Just remember to use very light sail material, about,2-3 ounce. On such a little 'model boat' ordinary cloth (4 -8 ounce) will be too stiff to take the right camber.
Good luck!
Arne