1. No, there really isn't a need unless you're going into a sketchy part of town. If you do that bring a parent rather than a knife.2. When I was 12 I babysat my sister when my parents had to go places but it was only for a few hours. As long as you're not being left alone for days you'll be fine.3. If you have a Netflix account, or your mom does, go to the "Horror Movies" category.4. Go on YouTube and find a song you like and then go to the recommendations and pick out new songs that you haven't heard before. Personally, I like Fall Out Boy, SayWeCanFly, Mayday Parade, Panic! At The Disco and a few more bands. You're 12 though so try looking up "Top 100 Pop Songs" and go through them and find a few you enjoy.