Panji,
The second plane after learning to fly is always a big jump. If you plan to go scale warbird the others that suggest you need more stick time are correct. Here is my recomendations for graduating to warbird.

1. Learn to fly and do touch and go's, dead stick landings loops, rolls and unusual recovery from both ends of the runway.
2. Get a low wing WM Emeraude or GP Super Sportster or CG Tiger any heshey bar low wing plane.
3. Learn to do all of step one from both ends of the run way windy, cloudy, sun in your face till it becomes easy and natural.
4. The one thing about WWII warbirds is learning to use flaps, how much to use when to use what to do what not to do.
5. My warbird trainer was a Yellow AC Cap10b, VQ makes a really nice 77" Cap10b thats pretty good on a Zehoah 26EI or glow.
You can sub the Cap10b with the Hgr 9 trainer mustang or PT 19 of the same size. Anything thats true low wing and has some area will do.

The Cap10b has flaps, is a true low wing and flys good and lands very good with flaps and good without flaps. This plane exhibits the same characteristics of warbirds but at a more moderate dose. The one thing you have to learn to do with a warbird is to learn how to drive the plane down the runway and not vear off the center line. That easy on a high wing trainer but on a warbird with a powerfull motor its not. Also you need something that has a bit of wing loading like the Cap10b to give you that sense of unstableness that a warbird has with out actually punishing you for any mistakes you make. Like getting too slow on landing.

There are many different approaches to getting to scale mine is just one way. all this depends on flying skill $$ and time invested and the desire to fly.

Enjoy and good luck

jds