Dude... be ready, everyone is about to tell you this.
"Search"
Now...
1. You don't want to keep 2 rings on the front and have them be shiftable with a single speed on the back. Stop being an idiot.
2. Since your rear is a 5-speed, is the hub threaded for a freewheel? Because none of those coggies will work if its not threaded and subsequently has a freewheel.
3. *edit I see you already got ur wheels* If you're getting new wheels, do yourself a favor and get a single speed wheelset. With a flip flop or something. then they'll be dished properly.
4. Does the frame have vertical, horizontal, or semi-horizontal dropouts?
5. Goto Sheldon Browns website. Read.
6. Repeat steps 1-6.
7. Repeat steps 1-5.