reality milling

hi,
my name is tei and I am an ambitious 17 year old without a lot of
money. I have been fascinated with turbines but the cost is to great
to buy them so I decided that the best way to get involved was to make
them. I have decided to buy some kind of cnc desktop mill or lathe
(sherline, maxnc, or taig) but i don't know if it can handle cutting
turbines and I don't have a clue how to even start on the task of
milling an impeller so I haven't had the courage to spend $1500 yet.
Can anyone give me any suggestions, hints or reality checks, I'd
really appreciate it.
Thank You