You don't have to register for every type of bar glass. Choose whatever works with your favorite cocktail.
coaster sets (2-3)
corkscrew (1-2)
wine stoppers (2-4)
wine decanter (1)
tray (1)
bar cart (1)
With bar carts, think double-duty. Use the bottom for bar storage, and let the top serve as a surface area in your kitchen or entry.
P.S. Don't be afraid to go beyond these basics with furniture + accents for your future home to give your guests a range of prices and ideas to choose from.