As you continue down your path of awesomeness, we'll probably talk about various equipment along the way. Things such as microphones, keyboards, cables, picks, stands, or guitars you can purchase from online stores. I've started an Amazon Shop List for you to order some commonly used items.
If you're looking to make a larger purchase and money is tight, there's a number of sources you can payments through if you're needing to make a big purchase such as American Musical or Musician's Friend.
Bonus Tip: If you're already familiar with playing instruments such as guitars. I highly recommend you try to purchase through a local shop such as these two Bellevue shops: Kennelly's music or Don Bennet's. You're more likely to get a great bargain plus this gives you an opportunity for you to actually feel and hear the instruments before purchase. It also gives you a chance to ask questions of an associate. Remember, they're a musician just like you!