That's how I presently do it. I've also tried having a number of sheets in my template file named Site Plan, Floor Plan, Elevations etc but inevitably I'd be renaming or renumbering as i would create the drawing set. So I'm back to just one sheet layer in my template.
Yes, but bear in mind, if you have created your template file correctly and Automatic Drawing Coordination turned on your sheet numbering and sheet title should be two-way between the sheet and the navigation palette.
Have you created a custom title block yet?