Make sure you don't forget the screen. They may look calm but can jump out of a tank very quickly. You will need incandescent lighting fixtures and gravel for flooring. The tank should be kept at 70 to 75 degrees during the day, but can drop to 60 degrees. The incandescent light helps to keep the cage dry so use it even in hot, humid summer weather.
Many species require humid environments and the light can actually be very harmful.
Sink a small dish for water into the gravel and keep a small piece of sponge in it. Be sure to put a rock in the cage for burrowing. You will find webbing in the cage. This is because the tarantula will spin but won't inhabit the web. Your tarantula can exist on crickets but they will only eat them if they are alive.