Hi, congratulations, and welcome. Deciding how you want your Yorkie to look is a very personal choice, and one you can change. Personally, I think they look great in just about any style. Check out:
Yorkshire Terrier Hair Styles | Hair Styles for Yorkies | Yorkshire terrier hair cuts, grooming styles
Perhaps you see something you like, if not, just do some searches...maybe print out what you think you'd like to try first, and take the photo to the groomer with you.
If you get a chance, post some pix of your fur baby...before the cut...after the cut...doesn't matter. I just like looking at Yorkies, 'cuz