I would bet that the edges on you're board are sharp enough for your beginning battles of learning to snowboard. I would focus on the fundamental basics and learning your equipment. I would research how to set up your board and how to get started. You don't wanna jump into it blindly, it can be very dangerous if not aware. When you have a better grip on how it all works, you could look into waxing and tuning your board.
I use a swix edging tool that maintains the proper degree needed. If you free hand it with a file, you will do more damage then good.