Starcraft 2: Tips for playing Zerg? Fastest most effective Build Order? Help!?

I got Starcraft 2 about a week ago, I started with Terran, found that boring, then i tried zerg, I think its alot more fun then Terran. Me and my 2v2 partner (Protoss) were placed in Bronze League, we win when we rush, but when we stay back and try to build an effective army, we FAIL. Help please <3