I'm assuming you mean b&w film? If so then this is what I would think you need:
- Development tank with film reel - allows you to pour chemicals in and out of the tank without letting light in.
- Changing bag - to load the film onto the reel and then into the tank
- Measuring cylinders - to measure the correct amount of chemicals or water to use
- Thermometer - to ensure the chemicals are at the right temperature
- Jugs - to pour chemicals into the tank, and to empty the tank back into
- Bottles - to store mixed chemicals that are reusable
- Stopwatch or clock - to measure the time the film is in each chemical
- Film clips - to hang the film up with
- Squeegee - some people use them to get the water off their film when it's hung up, but other people hate them.
You can actually buy most of these items in a kit, for single rolls of 35mm film then something
like this would be ideal, then you just need a
changing bag, some jugs, empty bottles and a stopwatch.
For storage you might like to buy some of
these negative pages which help keep them dust/fingerprint/scratch free.
Then you need to get some chemicals. You'll need a developer, stop bath and fixer. I use Ilford Stop Bath and Rapid Fixer for all my B&W films, but my choice of developer depends on the film that I'm developing at the time (D76 for 400 and faster, Rodinal for slower).
This is assuming you mean b&w film and not colour negative, which is a whole different game, although most of the kit is the same.