That's awesome that you identified a problem you yourself had that you want to solve. I'd encourage you to do some more competitive research as there are a LOT

That's awesome that you identified a problem you yourself had that you want to solve. I'd encourage you to do some more competitive research as there are a LOT of proofing services that use humans. One can also hire proofers off of sites like Odesk, etc. So with the knowledge that there are lots of competitors with humans doing the work, you might need to find a different strategic differentiator.