IF you are at STTB, then there is a free plans tab. There are lot of different plans, but the easiest and best wing to build is the RNAF wing and there is really good description for it with the DPS or Das Plas Stik. To make a Dihedral wing follow the instructions for the Buhor trainer, just make the RNAF top and bottom. The 2mm makes a much better airfoil because its much more flexible.
You can get the coroplast from several sources and the yard sticks from any hardware store. If you do some searching and some reading on the SPAD section of this forum or at Spadworld.net you will get most if not all the info you need to build a wing.
I never owned or flew a R/C plane and built a Spadet for my first plane and it was not hard at all. I've built a few ARF's since then and I have to say its about a wash in the amount of time and effort to build a SPAD or assemble an ARF. Give or take an hour.
OR you can just get a new ARF trainer and just put all you new found gear in it

It's all based upon whats in the wallet!
Good Luck,