I need every single track to be the same length.

Just to be clear, are you talking about tracks you already have recorded or ones you're going record?

In either case, starting to record at the zero point is easy.  However, if you've recorded tracks that only cover a section of your project, highlight the blank area(s) and use Edit/Insert/Silence.   This will fill in the blank areas.

On the other hand, if you have some tracks that run long with non essential material, you can use the razor tool to mark the end point, highlight what you don't need, then delete.