I will try not to be too lengthy

but this is a topic that is dear to every maker's heart regardless what he makes.
In my shop, for regular knife work, I use in order of their first use, though almost all of them cycle back during any project...
Light!!! Lots of light, both general and work station specific
Harbor Freight metal cutting bandsaw
Bader BIII grinder (any will do, 1.5 hp minimum and variable speed are the critical items; 2+ hp is preferable in my mind)
Ceramic and structured abrasive belts
Drill press
Disc sander
Vise(s)
Palm sander with a Micarta platen; good sandpaper in grits from 220-2000
Collection of various-shaped sanding blocks
Shoulder filing guide
Selection of needle files, various cuts and shapes, some diamond
HT oven and quench tank(s) or plates
Buffer
A couple of flex shaft machines
[Basic leather working tools, a separate list]
Renaissance wax
What's the absolute minimum? The best you can afford of the three:
Drill press
Belt grinder
Files
You do not need the "best" of anything to start. As it grows, your work will fund ever
more and better tools. It's a truism.
I definitely second Richard's suggestion to find a local maker to hang out with for a while. But be sensitive that any time you're working in his shop, he probably is not being productive. Few makers would turn down a sincere request for helping a new maker get started, but it honestly is costly for that maker. I don't know where you live but if you're within a few hours of Des Moines you are welcome to join me any time. I'm not much, but I mostly try hard.
Also as Nathan mentioned, many knife makers have a 'shop tour' on their websites. You can learn a lot from looking in the background of those photos. Right on Nathan!
Finally, read through all the stickies up top. There's so much valuable info there you'll probably go cross-eyed the first few days you spend reading. But soon everything will begin to come together in your mind and you'll have a complete mental image of both your desired shop and first dozen projects.
Go for it, and good luck!