The best way is of course if you can gain access to a metal break, which will give you good clean bends, you can also use a vise with soft jaws and a leather mallet with wood breaks to attain good clean bends, which will take a bit longer to produce the clean bends you will need, but can be done pretty easely, good bar stock brass in the size you will use is pretty easy to find, I picked some up at the local true value hardware store, but most hobby shops also carry a selection of brass stock.

Dave