Hi-Rez has put together some great videos on the subject. We definitely recommend you check them out.

Breaking In - Part 1: https://www.youtube.com/watch?v=P6_1kbQFuVM

Breaking In - Part 2: https://www.youtube.com/watch?v=z_xlEq8OruQ

Breaking In - Game Design: https://www.youtube.com/watch?v=5rb_0uWl5tM

Breaking In - Programming: https://www.youtube.com/watch?v=F1-CX3JMmqg

Breaking In - QA: https://www.youtube.com/watch?v=-nBtjXJRyLw