You have just said that you have darkroom experience. Obviously more than I do
Indeed there are tanks to develope 4x5 films, but you can do with trays as well.
For tray developement you need some 5x7 inch trays. You may also consider some plastic food containers as they can be deeper.
I used 3 trays (developer, stop bath, fixer) and two containers - one large for pre-wash (I put film to plain water for a few minuts before it goes to developer) and one for final washing - after fixing. Then I use one small one where the film gets a shor rinse (water + photo-flo - tu supress the possible water marks). Once developed you hang your negatives in the bathroom (usually the least dusty place) and let them dry overnight.
You will need some timer (I still use my mobile in a pocket) as you will be working in total darkness - you can not use safelight in this case.
The developer is your choice - ther are ZILIONS of them. I decided to go with Pyrocat-HD (cheap, long shelve life) what is not a traditional one, but that's what I have started with. Search around to learn more. I am not an expert.
For contact printing you need of course the stuff to develope the paper - but this you have done before. On top of that you need a light source with a timer to swith it on and off. If you still have an enlarger that should work fine. And you need a sheet of glass that you put on top of paper+negative sandwitch to keep them tightly ot top of each other. There are usually a few contact printing frame on the action site (paterson, jobo). Like this one or you cen get a more proffesional one with coated glass. I do fine with the paterson.
Good luck !