I've never run a QT before, this is just info I've gathered from research here on R2R.
When mine is set up I plan to fill it up with old display tank water and keep a bag of filter media in the sump of my display tank. Using display tank water means you don't have to do a full acclimation to the display tanks water all over again. I'd still do a quick acclimation though.
When I set up the QT, I'll take the filter media bag out of the sump and put it in a HOB filter on the QT and replace the media bag in the sump with fresh media so it can be seeded with all the healthy stuff for next time. If your using medication, don't reuse the old filter media. If you don't use medication, you can dry it out, clean it and reuse it.
Lighting should be simple. I like the idea of low lighting to help prevent a bit of stress to the fish, but I don't think that's actually a major issue. You just need to be able to see in there clearly.
You also need something to control the temperature, so heating, chilling air con whatever you need.
A notebook is a good idea. You can write down the date you added the fish to QT, keep track of water changes, medication, feeding habits, general behaviour, appearance of the fish, signs of disease etc.. It's handy for next time if you get another fish the same or similar species you can have an idea of what to expect.
Some different sized PVC pipes are good so the fish can hide somewhere. It doesn't have to be PVC, but it's cheap and easy.
I'm pretty sure that's it. Maybe someone with more experience than me will offer some advice though
