Hi, I am converting my van to make it practical for my band to tour without the need for Hotels!

I am considering having some of or all of the following electrical items housed within the fabrication. What I would like to know is what would I need to power it. I have discovered the term 'leisure batteries' would one work for the following? is it possible to have more than 1?

Standard flip down TV/DVD player, Basic sound system, a 10 watt mni guitar amp, an xbox, and possible a mini fridge? (do people use 12v ones for vans or something?

Please excuse me if these questions seems silly. I am a beginer! :)