You really don't much to start and you can collect over time. Of course you will need a set of t-pins from your LHS (Local Hobby Shop). You will also need an X-Acto style razor saw to cut balsa strips to length. A fine point Sharpie or other felt tip pen for marking will come in handy (a pencil will dent soft balsa). Sandpaper is also a must have. You can pick up rolls of adhesive backed sandpaper at your LHS in various grits. You can also buy straight aluminum sanding bars there too, or if you are like me and you have lots of scrap wood hanging around from household projects, you can just make your own.

I find a 12" combination square to be very handy. You can pick one up at a local hardware store for under $15. It gives you a good steel ruler and and a 90 deg block for ensuring parts are set square. While you're there, also pick up a thin 36" steel ruler - more accurate than a tape measure and very useful for checking straight and true. A bag of wooden spring style clothespins makes for a set of handy (and cheap) clamps.

In addition to CA, pick up some Titebond II wood glue at your local hardware store. You'll find that the slower cure time can be a real advantage in some cases (and it is stronger and lighter than CA).

Good luck and be sure to post your build progress.

Al