I have a Leopard Gecko about 5 or 6. i really want to get another one. what would be the best match?
should i get a baby or another one about the same age. The one i have right now is a girl. Should i get a boy or another girl. (i don't really want babies so what are the chances of a boy getting the girl pregnant?) If one did get pregnant, how many offspring does it have?

They are better to be by themselves.

It depends if it is 2 females then they are fine but if there is 2 males they might fight.It will have about 2 eggs each time. I would put them together. Try one night and if something goes wrong then don't put them together. Only leave them together at night if it is a boy and a girl. so the female wont get stressed out.

research and my brain!!

Don't put a baby in with an adult, she might dominate the baby and keep it from eating. Try to find an adult female and test them in the aquarium together for a few weeks. Make sure neither has a new injury and that both are eating. If both are in good shape and eating, then they're okay together. If you don't want babies, just get another female, and you won't have to worry about incubating eggs and all that.