Welcome to the world of bass. A fine instrument. I myself have played bass for 33 years. truly something you can enjoy your whole life.
You have some time before you can enjoy airsoft. I suggest you save your money, and spend the time practicing playing the bass.
Start by learning to read music... not tabs. This will serve you well in the future.
Read 8 - 12 bars every day. If you have any questions about bass, feel free to PM me, and I will get you on the right track.