Can you describe the Sprit Rig,

Do a search of the Internet for photos and diagrams.
Look at the photo of the Dobler skiff at www.jonesboats.com.
Look under sprit sails on my website www.ncf.ca/~ag384/Boats.htm.

and can you effectively use a small jib
with it?

Yes but the jib doesn't get you much except complexity on a small boat.