your first problem will be producing manifold solid models from sketchup.
Tutorials around on the interweb for that.

other than that - what davos said:
What material do you wish to print with?

How large a build volume will you want?

What will your smallest feature size be: 1mm? 0.5mm? 0.25mm? 0.1mm?
as far as:
I would suggest you try an go along to a local store or 3D printing business and ask to be shown around, most are pretty helpful.
These are as rare as rocking horse crap where I live. So I doubt that's much of an option. Plus they'll pretty much just want to sell you what they use. which might not be the right machine.