Congratulations on the never ending tool/toy quest.
First item would be a quality VISE. A set of collets or at least the sizes you plan to use. A set of 2 or 4 flute END cutting end mills or the sizes you plan to use. The set will come in handy when you start getting ideas that you never would of had before getting the mill like relieving liners. A nice keyless chuck is worth it's weight in gold to me now. I have a set of chucks that will handle anything from 1/16" up to 3/4" but use the 1/16" to 1/2" 99% of the time.
That will get you started but of course you'll want a rotary table, a slitting saw arbor and blades, a decent cobalt drill index, a complete set of step clamps, and .......................It never ends ! Once you start looking at tooling, your whole world will change. It's an addiction in itself, be very careful.
Rudy