beginning steps to building my cnc

[D.C.]

Belts and pulleys you can get from here:

5mm HTD® Timing Belts [4575] : Beltingonline.com, Supplier of power transmission and conveying products

Where about in Walsall are you, I'm starting my first build in the next couple of months and I'm in Bloxwich.

Edit to add: Jon's pricing seems optimistic and doesn't include all the little things that add up like a computer, software, router bits, cables, tubing for water cooling, bed material etc etc that you will actually need before you cut a single thing.

I think £1500-£1800 is a more realistic ball park figure to actually build a machine from scratch of the size you want that can do what you want.