Can anyone talk me through BBT and OPK?

Amanda • Roller Derby Mother of a 5 year old. Married 5.31.14

I'm moving into month 3 of actively TTC. I have read up on how to take BBT and decided I would start that this cycle. But other than taking it In the morning before I even get out of bed. I don't really know what I should be looking good for.

As for OPKs I don't know anything about them. So any advice or suggestions would be great :)