I met Andy MacDougal for the first time at the SGIA this year. He clearly is a talented screenprinter, a good guy and a funny guy. He has a cool website called Squeegeeville with among other things a good basic screenprinting book and simple equipment, in particular a great simple vacuum table set up for printing posters.  If you buy his book it has the plans in the back to build a practical functional vacuum table yourself, the photos follow. Check out his Facebook page for Squeegeeville.