Hmmm I would say tl.net is the best bet but really the best thing to do is to learn the 'normal' base builds and go from there.
Don't see like a nony build with pheonixes and go 'oh cool I'll do that'.
You will get stomped

But a safe build, totally standard build, as protoss, is like the 2 gate robo - which pretty much destroys anyone up until mid-gold level.
But yeah, there's no substitute for just playing as many games as possible, supplementing that with reading the strategy forum on tl.net and trying things out yourself.