There are a number of ways to finish TO, and it really boils down to personal preference.

Some will say that you shouldn't need any polishing - your final coat of TO should be good enough as is. You might find that applying some thinned (50/50 TO/turps) final coats helps to achieve a glossy finish. Personally, I find that I'm incapable of applying TO and achieving a perfectly level finish without irregularities creeping in (like dust etc.) so I do polish. I wet sand with 1200 grit, being careful not to get any water into bridge post holes etc, and also avoiding edges and the dreaded sand through, and then use Maguires auto polish (Scratch X / Ultimate).

I do also use wax. If you do, it's best to steer clear of anything with silicone in it. I've read that wax can attract dirt, so again, YMMV.