You have an ambitious project planned for someone who says they need a
lot of help.
It might be best to put this idea in storage for a while and
concentrate on a project from a kit that has a lot of educational
content. Something like the BOE bot would be a good choice. Then, you
would gain the expertise to understand the programming and
electronics. You might even cannibalize the kit to later put your
project together. The wheels could drive a belt to drive your turn-
table with sufficient force.
The BOE bot is a system designed with a lot of educational content
included to get a robotic hobbyist started. Once source is
http://www.robotshop.com/, for about $160, but there are other sources
as well.
The kit would handle some aspects of your ambition. But, the
mechanical design is more than a minor task. The weight of a device
to handle a CD is in a different category from the weight you want to
handle.
Joe Dunfee