Need help with tarantula setup

I want to know what i need for a basic tarantula set up. I decided to get a rosehair to help me overcome my irrational and annoying fear of spiders.

How big is it?

Check out my spider link. I talk a little about enclosures towards the end of the thread.

I dont have it yet but the one at the pet store is about 3 to 4 inches

You could go with a...
10g tank with a nice tight lid.
Exotera type of cage.
17L Really Useful Box. (I love these things)

You'll want something wider than taller.

I use Eco-Earth type of substrate for my Ts. You can give her a couple of hides and a small shallow water dish.
Most pet stores believe that they need to drink out of a sponge. This is wrong!

They don't need a lot of humidity. 50-60% range with temps around 75-85ish

At that size, don't keep the substrate wet. I like to overfill the water dish some and let it soak in.

Hope that helps a bit.

Everything helps. Im just trying to absorb as much info as i can.