What sort of van should I buy to convert?

I am planning to buy a basic van, and convert it into a living space, like a camper van. Im moving out of my parents soon but I can’t afford a flat and don’t want to share with people (Im very unsociable).
I need a large van that would house the basic things, like a bed and some storage space, maybe a table and a place to put a cooker or TV, something like that. However, it needs to be of a reasonable size, so that I can drive it easily on an average licence and ideally, be able to be parked neatly in my College students parking lot.
Any advice of a particular make or model? Thanks