Which tortoise?

[Shakey123]

Hi all, seems this is the place to go for the best answer for my partner and I in our search for info! We've got a large fenced backyard with lots of lawn and plants. We want to get a pair of tortoises, but I can't work out which species would be best for us, having never kept tortoises before. Ideally, we want a pair that are older, large enough to spend most of the year outside without fear of predators (we'll provide a safe enclosure for them to shelter in, too). Prefer a relatively sociable species that likes to roam around and make use of the garden space available Which varieties hibernate? Do they still need a heated indoor enclosure if they hibernate in the colder months? What gender should the pair be in order to get along with each other? Will 2 females generally co-habit more peacefully than 2 males? Should we buy through a breeder listed on this site? Would Leopards be suitable? Lots of questions, sorry! Appreciate any and all advice! Shakey