Crank,
I dont know what kind of a chain you need (single/geared), but a new chain usually comes with a quick link to connect the new ends. If one is not included, you can pick up a "power link" at any bike shop. The only other thing I can think of is getting the right length down. If you have the old chain, just match em up. If not, size it up before doing any chopping. If the shop you buy the chain from won't cut a few links off for you, you should find a new shop. Hope that helped.