Welcom to the board. There are a couple of ways to finish them. Depending on what you decide will guide what batting you want to use.
These are pretty large quilts to start with. You may want to do a practice piece first on your method of choice. Could be a pillow top, wall hanging or table runner/placemats.
Machine quilt, yourself or hire someone to do it. Suggest you get a walking foot for your machine to do this but not totally necessary.
Hand quilting. Needs the least investment in equipment but will take some time to complete.
Hand tying. This is you use ties to hold the 3 layers together. Easy and doesn't take very long or much skill.