Murray......

Re: style
Given the styles you suggested, I think you would be disappointed with nylon.

Re: calluses
After you have them, you'll display them proudly. BTW, playing is lots easier if you HAVE calluses.

Re: learning
A classical will usually be larger and a bit harder to get your arms around. The neck will be wider, which makes chord stretches longer, hence a little harder for the beginner.

For a firstie, I would suggest steel, less than dreadnaught size, with ultralight strings to make it easier at first. Later, you can heavy up the strings a mite.

Good luck....Tiger