Do you want to build a kit, meaning all of the parts are precut and it comes with instructions? Or do you want to build from scratch where you basically start with a set of plans or just an idea and cut all of your own wood? If you want a warbird kit, take a look at the ones from Top-Flite. You can get them at www.towerhobbies.com. Another place with warbird kits is www.skysharkrc.com. These are just a couple options, there are plenty more if you search.

Is this your first build? If so, start with something easier like a trainer plane. It will help you learn the basics; warbirds can be a little more advanced.