All the advice above is good, just consider that you actually have two "problems" to solve:
The first, and most obvious "problem" is learning how to use CNC stuff. You can design things in Inventor or Solidworks, then use a program like MasterCam (which might be a little overkill) to convert the design into G-Code which is what the Tormach controller uses to actually move the machine axes.
The second, and more subtle "problem" is learning how to use a mill. Break this into a few pieces:
Speeds and feeds: There's a lot on the web about this, so the short version is that for every given cutter and material there is an optimal rotating speed, feed rate and depth of cut. Too slow and you wear the bit almost instantly, too fast and the bit breaks.
Cutting tools: Buy a set of 'many' sizes until you get a feel for what you use most. Don't get TiN coated bits for aluminum - these are great for steel but aluminum wants to stick to it, which is bad. Look at McMaster 88505A35 or even better at
use-enco 320-0006. McMaster is very expensive and has a poor selection of tooling. Really small tooling is only useful in special situations.
Design for manufacture: The part needs to be able to be made. Not everything can.
Care and feeding: You need to understand the maintenance and care of a mill, and be absolutely crazy about making sure its being done all the time and correctly. That machine is NOT inexpensive, likely 10 times the cost of the lathe, about as much as a small car. Treat it right and be absolutely intolerant of anything else.
All that being said: Get in touch with Tormach. They really have a great program to get you started and answer all your questions. Use them as a resource, you'll be very pleased you did.
Also, this is an opportunity to reward those 'best' students: You can't train everyone to run the machine, so hold it as a 'reward' for <something>.