Get yourself the following -
- Ilford ID-11 developer - enough to make one litre
- Ilfostop stop bath - 500ml - many people just use water to stop. I always use the stop bath
- Ilford rapid fixer - 1 litre
- Ilfotol wetting agent - 250ml
A completely dark room is better than a change bag as you can stand and have plenty of space for the film to hang down without touching anything.
A changebag can get sweaty if you are fumbling. The added moisture can affect the film.
Get a dud roll and practice putting it on the reel of your tank in daylight, then with your eyes closed.
Get a thermometer and be accurate with your water temperatures.
Have fun