Scraggy when you do the UV snapshot you can select resolution.
You should see something like 1024x1024 which I think is a pretty good starting point. Can always downsize the texture later.

Also remember that all your UVs for the model must be placed within the top-right quadrant in the UV editor.

I found DannysUVTools v2.0 to be helpful as well. Downloadable from his website.