I don't think a Teal only offense is really going to get you too far. If you can try and add some other themes like Garden Tomb or Judges that would be great. I am coming from the standpoint of a complete collection but I don't know if Judges or Garden Tomb are themes you have right now. If if you don't have enough cards to splash something like that teal isn't a bad option, it's just not the best.
As for defense, assuming you play straight teal, you'll want something that draws well because teal is very slow. Pharisees are about the only defense I can think of, as Egyptians are fast but worse than pharisees in about every way.