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For the first month, I'd start testing around CD13, just to be safe. I'd suggest doing it when you get home, I was able to get a positive whenever I tested that late.

I typically had shorter cycles and was compulsive about OPK testing for a couple of months. I found that for me personally, I would only show the positive surge on OPKs at night and not in the morning. I could even get positive surges two nights in a row, but not during the morning in between. So if you have any doubt, I'd recommend testing with FMU and at night if you can. I also hated the "line as dark as" kind of tests and ultimately just went with digital OPKs after a couple of months of wasting $$ doubling up on tests. Good luck!

I usually started around CD 10 and tested 2-3 times a day (which might have been excessive but it seems pretty common). I always had better luck getting a positive in the afternoon or evening than in the morning.
Also, there were a few months where I never was able to get a positive using the Wondfos but I was temping so I knew I ovulated, so don't freak out if sometimes you don't ever get a positive, I think that's pretty common too...
Like others have mentioned, it might be worth having some digitals around to confirm in case you have a 'questionable' result where you're not sure if the test line is really darker than the control...
Good luck!

My cycles were 34 days or so and I Od between CD18-CD20. I usually didn't bother starting to test til CD13 or CD14 once I got over the paranoia I'd miss it. I'd usually test around 2 but 6pm when you get home should be fine - I read LH spikes between 2pm and 8pm. If you want to go all out the first month, you can use FMU and then test again when you get home so both tests will be 12 hrs apart, then you definitely won't miss it.

i ususally start the first day of no spotting...so i can track when my surge begins...OB told me the most important is 24-36 before you actually get a positive because its can take up to 10 hours for the swimmers to get to their destination...which makes sense...

I tested with FMU starting on CD 15/16 since I have a 34 day cycle. I tend to O later.