Grant,
Welcome to RCU and the terrific world of RC flight! It's a great hobby, and there are a lot of good people involved. Many of them stop by here, and a few even live Down Under!

Rob gave you some decent advice and good info, and while I'm not sure exactly what you mean by "building my own", I'll add some advice....

Before you jump into a scratch build project (that most likely won't be fly, unless you're trained for it), spend a bunch of time on this site reading. Beginners is a good Forum for the basics, but if your serious about building your own, try the Design or Aerodynamics forums. (Don't remember the exact names.) Getting the proportions of a plane, the wing plan, wing and stabilizer incidences, engine thrust, and center of gravity right without knowing what you're doing is unlikely.

While the "TLAR" method of design (That Looks About Right) actually works pretty well, you need to have had some experience with planes first.

If you were talking about assembling an ARF, then you're on the right track. (Ask questions first, & READ!)

Whatever you decide to do, good luck. And most of all, HAVE FUN!
Dennis-