Lauren,

I've answered most of your questions here:

Our software assumes you're using full cross stitches and not half cross stitches.

This version of the software doesn't have a provision for outlining (backstitching) or French knots. If you're working from a photo, you probably don't want to use French knots unless you're trying to give something a certain knotty effect.

The size I explained in the link above. I'm unfortunately unable to answer that question without knowing what count fabric you're asking about, what size a standard piece of paper is for you (here in the US it's 8 1/2 x 11 inches; in Europe I believe the standard size is called A4 and I have no idea what size it is) and if you're using something like a linen, are you stitching over one or over two?

However, that said, size is a simple calculation if you're working in inch measurements. If you're using 14 count Aida cloth, 14 (for one square) x 8.5 (the width of a sheet of paper in the US) = 119 stitches across. (I don't know if European measurements are handled in inches or centimeters.)

Hope that helps and sorry if I'm not understanding your questions!