They're kind of rough, but everyone has to start somewhere.
Grinding on a 1" x 42" is going to be difficult. I'd try to at least get a 2" x 48" from Sears; at least you would have a decent platen then. A 2" x 72" is the way to go if you don't mind spending the cash.
I think your best bet will be to order a few bars of 1/8" 1080 and practice. Knives made from files are cool, but not really ideal; especially if your just starting out.
Come up with a really simple design and put a flat chisel grind on it.
Make a dozen of them and try to make each one better than the last.
Afterwards, then start thinking about adding swedges, etc.