Since you're "missing" the front wheel, here's a good opportunity to get a new/ proper track wheelset here:

http://www.velomine.com/

Then get the other odds and ends such as chain, lockring, tires, inner tubes, cog, lockring here:

retro-gression.com

Pretty much the lowest prices on the net @ both those sites; doesn't hurt to check amazon & ebay too.^

You'll need 1/8ths chain & cog. If you plan to keep the original crank, get 19T.
700C wheels.