What is the best van for me to buy?

I’ve always loved vans and am now looking into buying one. Thing is I don’t know the first thing about vehicles let alone vans. I am looking for something that will be easy for me to work on myself and not have to take to a professional. It has to be roomy since I plan to take it with when camping and traveling. Alright gas mileage is a plus though I do know vans are gas hogs. I’d really love something from the 70s but would be willing to sacrifice that. Also, like I said, this will be for traveling so I’ll be majorly redoing the inside. Nothing like adding a sink but I will want to be able to sleep in it if I have to. Though this will be my everyday vehicle as well. Currently there is no set budget since this probably wont happen until next year but if there is a really great suggestion that will end up costing a lot I’m still willing to wait. So, any suggestions?