I would use florescent lighting. It is brighter and cooler.
Rather than buying a big sink I would buy a JOBO ATL 2 plus or better. They are programmable, fully automatic, and can process anything (film, prints, color, b&w) up to 20x24. You will need both a tempered water supply and a cold water supply along with a drain for the JOBO.
Make sure your darkroom is vented. I also have two air purifiers in mine. They both use charcoal filters which will remove toxic fumes.
My darkroom serves as my office as well, so I actually have a window with a nice view in it. I have a light tight shade that allows me to close off the window when I am processing. My desk and computer are in a side room off the darkroom with a door. This is real nice because I have easy access to desktop computer and a database I use to record all printing information about each print I make. I also surf the internet when I am waiting for my ATL to process something which is exactly what I am doing now:-)
Make sure you have space for a film dryer. I use the JOBO Mistral II. It does a good job at keeping dust of the film while it dries.
I have small compressor that is connected to an ionizer so that when I blow film or anything else the ionizer will neutralize any static charge allowing the dust to be easily removed.
I have tons of cabinet space, and I use every bit of it. The more cabinets the better.
Hope this helps or at least gives some good ideas to think about.
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