This is a question that we often get from sitter and owners who work with Rover. Help the community out by answering them in our forum!
I would take things slow by doing introductions in a large open area. Keep an eye on both dogs body language as they interact. Puppies will not be super keen on dog language and your older dog may get frustrated and/or try to correct them. Make sure that if your puppy is bothering your older dog too much that you allow time for them both to rest separately. One thing I like to do as well, is to have a smaller penned area for the puppy to hang out in while the older dog is around to get them used to seeing and smelling each other. Supervision is key, with or without the gated area, until they are both completley comfortable with one another after several days together.