First of all if you haven't introduced them yet DON"T. The new chin needs to be quarentined for a month before they come into contact with eachother for health reasons. He needs time to adjust to your house so you don't introduce anything to the chin you already have.
After a month, there are a variety of different methods you can try. Personally I would start with cages in the same room, and let them have separate playtime. See how they react to eachother when one is in the cage, and the other playing. Take it slow. They may get along right away, it may take a little (or alot of work on your part), or they may never get along.
Good luck and read up. There is alot of good information on this site.