New to OPKs and Conceive Plus

Brittany • 27. Finally got my BFP after 11 cycles of TTC by using the SMEP, Preseed, and a whole lot of prayers!!
Hey ladies. I have some questions about OPKs. I'm on my 5th month of TTC and have decided to try OPKs along with Conceive Plus lubricant. I know how both products work but want some tips and advice to make sure I'm using them properly. When is the best time to test with my OPKs? What CD should I begin using them? Should I test once or twice per day? Have you had a successful pregnancy using one or both of these products? Any advice is appreciated!