Hi Steve, welcome to the forum!! There's lots of information for building a CNC router on here as you've seen...get a specification of what you want to cut (apart from everything!!) and how big a cutting area you need (you'll always want a bigger area...) along with the budget you've got and get a drawing knocked up and start a build thread. Don't be afraid to copy others designs, or bits of them, they're all on here for reference and for others to copy.

All the best!