OP, I totally just got back from the first adventure. As another youngster who was pretty new to this kinda stuff I can tell you it's a life changing decision, a very rewarding one at that. I'm going to lay down some advice though.
-Never let being a female hold you back. Take some precautions though. Learn how to throw a punch in the right place or work on screamimg or carry some pepper spray. I bumped into some trouble when I was doing my thing, luckily I got out of all of the situations unscathed. It is nice having a buddy on the road to watch your back when you pee or something. Keep it in mind.
-Keep on your toes and always use the senses. Not only is it just awesome to connect with the present but it can also save your skin. Don't listen to music via earbuds when you're on the tracks or walking around an area that's givin you the heebie jeebies.
-Have the proper air about you. Walk with confidence, man! Or humility. Or terror. Pick n choose for the right situation. I walked into a store lookin like a scared lil puppy and I got a kickdown. Adapt to your liking.
-Pack light. Especially with train hopping. I can't stress this enough. This link is especially awesome. Read up.
http://vagabond101.com/whats-in-the-bag.html
-periods? Mooncup. Save yer pennies.
Be safe, m'am! Welcome all, welcome us!