I think that, really, you need just three (3) things.
1) A good sharpening stone or sharpening device of your choice. I think waterstones are the best. Extra-extra fine grit. 1200 or even more.
2) A bottle / can / vessel of your choice of GOOD oil like Break Free CLP with a 1" round brush to apply it. Put a drop (and a drop only) of oil on the brush and brush evenly any surface that must be protected against rust.
3) Metal polishing compound.
If you feel you really need it you may add an old toothbrush to clean the inside of folding knives.
I find that a folded up paper towel and a toothpick are all that is really needed to clean everything when necessary.
All the tasks required by normal maintenance of your knives can be made indoors on any flat surface.
Remember: knives are simple tools, that to be useful must be at hand when needed (read: always), always in good condition. Maintenance equipment must NOT be more cumbersome than the knife it's supposed to take care of.
A 20" slab of oilstone with its oil flask, assorted ceramic rods, set of screwdrivers for taking the knife down and so on won't be very useful when, going out hunting or camping, you don't have them with you.
A tiny nail polish bottle with Break Free CLP or a Tuf-Glide cloth and a small water stone is all that's really needed and that you can carry around EVERYWHERE without any inconvenience to have your knife always clean and sharp.

Additional gadgets are a good way to waste money and won't see much use after the first or second time you try them.
If you want to take down knives and do some serious repairs (things that should be left to the knife maker) you may consider proper scredriver sets, avoiding the cheaper ones and going directly for the best quality.
It would be plain stupid to spoil a 1000$ knife because your 2$ screwdriver tore and slipped on the polished mother of pearl scales, isn't it?
The screwdrivers must be properly sized to fit snugly in the screws and to be handled securely.
For normal slot screwdrivers go for the hollow ground bits, discarding the tapering ones. Hollow ground bits present a flat surface that greatly reduces the chances of the point slipping out of the screw slot under heavy torque.
I go as far as having a screw driver for each type of screw in my handguns, perfectly filed to size to fit THAT screw
