A bareboat yacht charter is not really a bare-boat. It really refers to the fact that you will be skippering the boat yourself. The boat will usually come fully equipped with all the kitchen stuff, utensils, plates, cups, etc. Plus linen and towels are usually supplied.
To skipper the boat yourself you will need an impressive sailing resume which includes courses and experience. Contrary to belief, you don't need a sailing certificate just an impressive resume.
An impressive sailing resume really means comprehensive courses relating to Bareboating as well as about 50 days of sailing in your history - about 1/2 of which should be as master of the vessel.
A skippered charter means a bareboat charter PLUS you hire a professional skipper to be responsible for the operations of the boat. The skipper will typically teach you what you want to learn if you would like and will allow you to steer the boat as much as you would like.