Before you buy stuff for an old cd changer, are you sure it is worth basing a system on? Is it running well? Do you have a lot of cds to play? These days all I do is rip my cds to a drive and play it from there, the optical disc players I have are more for video and specialized discs (blurays, dvds, sacds, dvd-audio, etc.).
Yes generally you need something in the way of amplification and speakers (or they can be powered speakers). You mention you want to combine it with video, so an avr (audio video receiver) is possibly another thought. What would the video be....an old tv or latest tech?
How about a budget?