I generally use OPKs from
Here They are very accurate for me. Other people really like the Answer brand tests from Walmart (I never had great luck with those myself though). Some people have better luck than others with certain brands so it's really kind of a trial thing. Also- there are the digital ones that take all the guess work out of it, but those are a bit pricier.
As far as the FSH test, I'm not sure when it would be appropriate to do that test or if any "at home" kit would give you accurate results... Hopefully someone else can offer you some insight on that! Good luck!