This really depends on what kind of party you're having and where it's going to be. It can be as simple as just using a drawing pin to stick up the fabric or some sticky tape (one that doesn't remove paint or paper) to hold up paper. If you're not allowed to hang things on the wall at your venue, then a backdrop stand might be what you're looking for. Amazon sells many different sizes at a variety of price points, depending on what you're looking for. Most stands can be changed height-wise, but normally all come with a minimum width, so keep that in mind if you have a small space.