Ooh, you might get a little overwhelmed with responses with a relatively vague question like that. But hey, you've come to a good place.
1) For astrophotography (AP) you basically only need a camera. A camera on a fixed tripod and a wide-ish angle lens and you can shoot starfields and perhaps even the Milky Way if it's really dark and clear where you are.
2) For Lunar and Planetary photography you'll want a zoom lens or telescope really, to get closer. An Equatorial (EQ) tracking mount helps, but isn't essential.
3) Reflectors aren't necessarily the best telescopes to get for AP. Newtonian Reflectors are probably the most common, but don't always allow you to get focus with a DLSR. Refractors are generally the best, and a good one to start with.
4) T-Adapter and T-Ring are the two items you'll need to attach your camera to a telescope. T-Ring will be specific to your camera, which connects to the T-Adapter, which slots into the telescope focuser.
5) For Deep Sky Objects (DSOs) which are generally very dim and require long exposures, your main requirement is going to be a motorised EQ mount. Something like an EQ5/EQ6, or an AstroTrac. These turn your imaging equipment to counter the turning of the earth, and thus keeping the stars from moving. The best telescope in the world is mostly useless without a good mount. The best mount in the world could get good results from even a crappy telescope, so the mount is generally the most important thing if you're wanting to take long exposures.
What is it you're wanting to photograph anyway?