Making the most of a machine

I'm totally new to this diy cnc movement that is going on. I'm a truck driver for a profession and i see fully capable machine shops every day. I'm not looking to match their speed or size i just want to build a machine at home to do the most it can. I'm hoping for some advice or opinions on a few items because i have no experience with anything yet. My goal is to go big.... as i do with everything... Im trying to start at 1000mm x 1000mm for x/y

The bulk of my parts will be bought from...

Making the most of a machine