FlameABell
Donator
This is a great guide that will walk you through all the aspects of exactly how burn cards work and how you can use them to your advantage.
http://www.titanfall.com/burn-cards
http://www.titanfall.com/burn-cards
Really glad they didn't go down the whole microtransaction road and have the whole "buy a pack of 2XP burn cards for $5". Because that would have been really easy to do.