I started on 1640 (See Clem's post above) for the Rack and Roll Season. I came in with:
Basic Mechanical Skills
Computer Programming - lots of Micro-computing chip skills (lots of PIC experience and that was the IFI controller) in assembly and C
Electronics
Project Management
Basic Math skills and some physics knowledge
Build lots of erector set / go carts / etc as a pre-adult
Built stuff in Lego / Metal / Wood with my kids
Teaching experience at the college level
Web based systems -- I got our second and lasting website up
Wicked sense of humor(*)
I did part FRC / FVC the first few years and then moved more to the VEX side.
FRC is good for learn as you go.
I did programming, some build, lots of project / logistics management. I drove once, wrecked the robot, haven't driven since
(*) Foster phrases "Well I'm just the web guy but .. ", "That's not going to have a happy ending". "Hope is NOT an engineering strategy."