WB simpbow, good to hear that you're all sorted out now + that you survived the move
Yes, you will need a 77mm adapter ring. If it's an ultra wide angle lens I'd advise you to also get a single-filter holder (as opposed to the standard holder which holds 3 filters) in order to minimise vignetting.
Again, yes you'll need a step-down ring 77mm-67mm to use your 77mm polariser with your 67mm lens. Beware of vignetting at the wide angle when using rings with wide angle lenses.
I haven't used the pixalo printing service yet, so can't comment on that.