Your darkroom should be set up properly so you know where everything is and you can follow the developing procedures in the easiest manner. It makes sense that you can follow the process in steps without having to go back and forth across the room. Have everything in its proper order and it will make life a lot easier. Make sure that no outside light can leak into your darkroom. You may need weather stripping or duct tape to achieve this. Most darkrooms are split into two sides. This isn't necessary, but it's helpful. The side with the sink as generally called the wet side. This is where the chemical mixing, film processing and paper processing occurs. The printing, cutting and finishing work happens on the dry side. Two separate sides will ensure no liquids will splash on your paper, cutter or enlarger. Make sure you have a good ventilation system to blow all of the fumes outside of the building if possible. Counters or drawers are ideal as storage areas. Many people use spare bathrooms as darkrooms.