Another good light that i also have that is almost as cheap is this
fish need it;lights; food;Sponge
It has a much nicer look to it and the quality of the fixture is much better in my opinion.
I use a single koralia 425 in my 29g cube and it seems that and the return is good enough flow.
For a test kit i would look at the API saltwater master kit. It's about $20 or so online and has the following tests: ammonia, ph, nitrite, and nitrates. All the basics that you'll need to get started.
Once you start to stock corals I would suggest getting these test kits: phosphate, calcium, magnesium and alkalinity. I use salifert tests for these as the API isnt as easy to read or as accurate. red sea makes some test kits for them as well that I hear are pretty good and will cost a bit less than the saliferts.