check here Datateam Publishing Limited they publish 2 screen mags (one for graphic, one for textiles) and do a big trade show every year - they must have a list of advertisers, so you can track stuff.
do you have a local college or university? ask where they get their stuff.
there are some waterbase systems over there we don't have here, and vice versa. Dig for info. buy pro gear like scott says. talk to the other printers in the rest of the isles that hang on GP.
and get out and find your local printers. they will be your best friends if you get into this and you want cheap shit