Need a Primer for Ubuntu

[Scooter]

Good Evening List,
 
I may be trying the wrong flavor of Linux, but I must start somewhere.
I have been reading for two weeks and STILL don't know which direction to
go!
Ubuntu's website and the general atmosphere (people and emails) made me WANT
to learn here.
 
The "talk" has alluded me. It reminded me of the 'ole Apple II days. Writing
programs was a necessity. But I quit programming, when I could afford a
really good system (Amiga). Then it was 20+ years with Microsoft, but things
in the Microsoft World are getting much too expensive and complicated for my
needs. Open-Source software has almost replaced everything, except for three
critical areas; the OS, CAD and music (my hobby).
I'm a Misc. Metals Detailer (CAD) and Project Manager by trade &  and a
amateur Web Designer.
These two worlds are my working life. I tell you this so you understand my
point of view.
I am unable at this point to let go of Microsoft (MS) because I need it to
make a living.
 
I have run trouble shooting (MS) at many companies to earn my way and am
having a lot of trouble with the Linux lingo and protocol. It is an alien
world to me at this point, but it is constantly pulling at me with intrigue
and possibilities.
I understand from several articles (WIKI) that Ubuntu is probably not the
best choice for me, but I need to be (at the very least) a "high schooler",
not a "kindergartener" in the Linux world, before I CAN let go of MS. 
THE main question is, WHERE do I start. There are SO MANY "flavors" and too
many directions to go in!
 I need to go in the direction of my livelihood, but there are no beginner
books for the computer savvy. No general comparisons  between the two OSs. 
I don't even know where to look for software that is exclusive to Linux AND
in my fields of interest!
I need HELP.
 
Take Care,
Scooter
College Park, MD 20740
 
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