TOTAL darkness to load the film onto the reel and then to load the reel into the developing tank, cap the tank, and then the rest of the process can be done in full room lighting levels. A changing bag from Kalt is handy to load the film reels if there is not absolute,total, India-ink type darkness. You need a developing tank, and film reels....I prefer stainless steel reels, stainless steel tanks, and tanks that have a stainless steel top, and a stainless steel pour-spout cap: I have and prefer my vintage Honeywell NIKOR tanks and reels, but there are other types of tanks and reels, made of plastic.
So, I would get Kodak HC-110 developer concentrate to develop my film. A marked syringe or a small, graduated measuring cylinder, a measuring cup that goes to 16 ounces, or perhaps 32 ounces, a stirring stick, Kodak indicator stop bath, and Ilford or Kodak rapid fixer. You need some good bottles to store the mixed-up stop bath and fixer...brown bottles with screw caps work pretty well...32- or 40-ounce beer bottles work adequately.
A timer is nice...wristwatch, smartphone, or GraLab...whatever ya got!
Thermometer...darkroom dial thermometer, process thermometer, whatever. The thermo needs to be able to read in the 65 to 76 degrees Farenheit zone. Couple of funnels. Kodak PhotoFlo as a surface tension breaker for washed film. Film clips to hang film to dry...need a bottom clip too, in my opinion.
If you would like to buy locally and have the choice of buying some amazing "classic" products, one of the oldest continuously-operating camera stores in the entire region is located about three blocks off of Interstate 84, aka The Banfield Freeway, just a couple miles east of the river at Hollywood Camera.
Hollywood Camera Store - Northeast Portland - Portland, OR
Ed has owned and operated the store for over FIFTY years...this is Valhalla for film shooters...and darkroom workers looking for classic types of darkroom gear! If you'd like, I could show you how to develop your first batch of film, either 35mm or 120 rollfilm.