Not sure

How would you play a medium to large pair before the flop? Would a person lead out with a big or little bet or just call?

Depends on the situation, blinds, your position, chip stacks..
I almost always raise high pairs (TT and up) if there are no raises in front, and reraise very high pairs.
Medium pairs can be played for set value if you can see a cheap flop, so you can often limp in with it. The chance of hitting trips on the flop are about 10%, giving you great implied odds. But there are also situations were you can call a raise or make a raise yourself with it, maybe you can give some more specific situation were you want to know more about?

Early to mid position I usually limp and call a raise unless I was short stacked, then it's a push. Late position I would raise if no one else before raised. Alos, there are many factors that coudl alter my decision like stack sizes and what kind of players I'm up against.