It's a bit of a drive from orlando, and there may be one closer to the area, but there is a range in Fellsmere/Sebastian that is pretty good. It's publicly owned and the staff are not too Nazi-ish.
It's something like $6 all day to shoot and you can shoot anything you want, even .50. They have a pistol range out to 25 yards and a rifle out to 100 yrds. They also offer a 250yrd shot, but this is through a tunnel and there is an extra fee because there are only 2 lanes with that shot. They also have skeet, trap, archery, and air gun if that's your thing.
Take I-95 south to the Fellsmere/Sebastian exit. Head east for about 1.5 miles and there will be a sign indicating a left turn to the range. It's just that simple.
There may be a range close to you, but i'm from further south, so I dont know.