Aaaaha!,I buy used books myself!!

They're pretty cheap to buy aren't they?!...I get really good copies for just $1.20!!!

Shouldn't cost much to open/run the shop,you don't need anything except good bookshelves,cheerfull wall posters and someone to keep everything in order/sell the books—depending on size of operation,that should be no more than one-two people.

You'll need decent lighting in there though;I HIGHLY recommend installing LED lights—very cheap to power.

All the best.