well, as others on here will tell you......you should not dose anything you cannot test for.
As far as test kits go, iniitially you will need ammonia and nitrite, but I would not buy these. Simply take a water sample to your LFS
for those and they'll test for free. The kits I would definately buy are nitrate and calcium (if you plan on having any corals)
, others will tell you this also, but a 10 gallon tank is really tough to maintain because of the small volume and one small change could be catastrophic. If there's any way to go 15 or 20 gal
, that would be better.