I would start by tracking you temps
If you go on
www.fertilityfriend.com you can get a free trial membership (I believe its 30days) and they send you daily emails tutorials on how to chart and such.
As for OPKs, depending on your normal day of ovulation you start testing with those about a week prior to Oing, this help pinpoint ovulation better.
When you purchase OPKs most of the brands give you 7 tests, if you buy the Answer brand you get 30. I like this because you don't go through them as quickly.
Hopefully some other ladies can chime in and add any information I missed.
Good luck and don't hesitate to ask questions along the way