Prior to placing an order, ensure that you have all the instructions provided by your institution with regards to cover type, size of paper, lettering on spine, margins, and number of copies to be produced.
dissertation binding could mean anything from hard cover, soft cover, among others, but ultimately, it comes down to the specific requirements of the institution. It is best to ask about page sequence, quality of print and color printing requirements as well. What requirement has your university provided you with?