New to BBT

Melissa • Follower of Jesus, pediatric nurse, TTC #1 with my adorable husband
I've been ttc #1 for about 3 months now. I've used OPKs and got 2 positives last month but a BFN and then AF came. I am looking into temping since I know that's the only true way to tell if you've ovulated. I've ordered a basal thermometer that is accurate to 2 decimal places and got a blank chart online. How do I temp? I know to take it every AM before I get up or do anything. What kinds of temps signify that you've O'd? I need a little help from ladies who are more knowledgeable about this than me!