Tren is the goat but it isn't for everybody. If you're having issues with it or if it's your first time, you should try it at maybe 200 mg a week and see how you do first. Don't run it more than eight weeks.
The key here is going to be diet. You need to be eating good quality food. That's how you're going to get bigger. Testosterone typically boosts appetite. Equipoise does a good job of it too.