horde theory?

what is the strategies for both sides?

1. Take the initiative and not lose it. Eventually win.
2. Counter and outsmart the player with the initiative, forcing them to lose it.

http://ja.lichess.org/forum/general-chess-discussion/proof-that-chess-is-a-losing-game#4

For the Horde, try to make a "double pawn chain" either pointing queenside or kingside; but don't commit too early to either side. Don't try to rush / liquidate the center since that just helps the pieces.

How can anyone learn a new game playing such short time controls? There is a lot to think and as you are a good player, you will learn quickly, as soon as you invest some time.