Wishy-Washy Wanderer

Greetings everyone, I've just discovered 0.A.D and am very interested in contributing to the game. I have a little bit of experience with C++ and Javascript. But I'm not really sure how to get everything setup. I have not done anything like this before and am unsure how to. I've gone to the development section and I'm still not sure how. Can anyone here please help me understand how to get a development enviroment setup?