That fixture should work, yes.
It should come with hardware to mount it to a ceiling.
What distances are you planning? I think the T5 are really best when in a fixture with a reflector (you can buy clip on ones) a bit further away.
Clapton is acclimating okay I think. He's quick as lightning so I'm not sure how much I should bring him out of his house yet. He's not at all interested in his salad though. I wonder if I should change what I'm giving him. Least he's eating his crickets.
Things to do:
Buy calcium powder
Material to raise surface for basking spot
Scenery decals for back of tank