So maybe we should talk about your budget. Bottom barrel for machining aluminum is something like a Syil X2 for a couple grand. Up from that is something like a Tormach which is in the area of $10k. Beyond that you are looking at $40k plus for a Haas or something.
I think you would be hating life if you ran production motorcycle parts on a Syil. I'm not sure what parts you are making so a Syil might not even be big enough. For triple clamps and stuff like that it would work but its no speed demon.
The tormach style machine would probably be the ideal size for you but I'm not sure what your budget is.
A "real" machining center like a Haas will obviously make all the parts you need and run all day without problems but you have to have enough parts to pay for the thing. With the Syil (and maybe the Tormach) you don't NEED to have the machine pay for itself. This gives you freedom to learn at your own pace and not get in over your head.
If you are really bewildered by the whole deal then some classes may be a good idea. The classes for the first couple quarters of any manufacturing technology type program should be useful. Here are the relevant classes from the first two quarters of a local mfg. tech. program.
INT 107: Principles of Manufacturing
INT 109: Fundamentals of Tool & Manufacturing Processes
INT 116:
CNC Operations
INT 113: Fundamentals of
CNC
INT 141: Applied Shop Mathematics I
ETD 198: Personal Computer Applications for Engineering Technology
OPT 100: Tooling & Machining Metrology
You can learn a lot by following build threads guys post here. Also read up on mach3, it is probably the software you will end up using for machine control. You could even download mach3 for free now and play around with it without a machine. Also looking up some reference material on G code, feeds and speeds, etc. will help.
Another possiblity depending on your work schedule would be to go talk to a local machine shop. Tell them you will sweep the floors for free if you can watch the old guys work and ask them a question every now and then. Most of the old machinists I have run across are pretty receptive to questions if you show them you are interested in the trade.
Matt