Welcome, I don't use Mach all that much, but it's very popular on the cnc forums. Check out cnczone.com if you haven't. I'd be happy to show you what I know. I have a small CNC lathe I just got that is running Mach as well. I have a VM with Mach and can bring the lathe in to play with too, let me know when You'll be around?
If you'd be willing to give me tips on how to grind lathe tools I'd be thrilled. See it online is just not the same thing as doing it.
What kind of CNC do you want to build?
I'll be at next weds meeting, and working on bringing life to a donated CNC inspection tool with some of the guys. Drop by if you can.