Pretty much the same as Karen re the OPKs. I used internet cheapies on the first cycle I tracked and sellotaped them to a piece of paper so that I could see any patterns then once I knew that I ovulated on 15dpo I did the following:
Test twice a day using internet cheapies from 10dpo then on 13dpo at least 3 times a day and every 4 hours during the day from 14dpo until ovulation. If I get a near positive on a cheapie back it up with a Clearblue digital to be sure.
Doing it this way I've used around 4 of the Clearblues a month. Buy them online - they're a lot cheaper.
My testing regime might sound overkill but I had to miss IUI one cycle because when I got the positive it was midday and I hadn't tested since the night before. The clinic said it was too much of a gamble to do IUI (natural) not really knowing the window when I'd started the surge.
I suggest you buy 100 internet cheapies and 20 Clearblues (I buy them from HomeHealth because I try not to shop from Amazon).
One thing to watch out for is the tests getting gradually stronger but then dropping to nothing before you've got a positive. Don't panic! This turned out to be a pattern for me every month. My LH would look as though it was nearly there, then go really weak for a day before building back up to a positive.