Hi, Mark. Part of the answer depends on the size of your table. If a piece of hardwood faced plywood will span the table, you have a simple project. If not, you have a difficult one. I would cut an octagonal or hexagonal out of the plywood just slightly bigger that the diameter of the table. Then you can buy or make suitable molding to fit around the edges of the plywood.
Finishing this well will be some work. Sand, seal with a spit coat, stain, and several coats of poly would make a good finish. You want to do this on the bottom also to prevent any tendency to warp. The plywood and the solid wood molding may still look slightly different. This is partially because of the way the wood is cut. If you can't cut the top out of one piece of plywood, it may be too much for someone with little experience and few tools. The angles for cutting the moldings are available at several sites on the web.