Typical indenting styles indent a specified amount within every control structure. The specified amount is usually one of 2, 3, and 4 spaces. People also vary on the placement of braces.

Whatever you do, the key is to pick a style and then be consistent. Mixing and matching and random indentation makes your code much harder to work with.

If you are too lazy to pick a style, you can just download perltidy, run it on your scripts, and then accept the way that it does things.