I was in the same situation you're in last year... Only difference is, I'm in Texas. ^_^

• Depends on the person. Personally, I dropped out of the 2-year community college I was in because I lacked focus. Going to a 4-year college would mean you'd -have- to pick a major going in, so you'd have more focus but less options. That's true to a greater extent if you live in a dorm.
• No real idea here. My only advice is to remember how awful your classmates were in school and that you'll have to deal with asshole teenagers if you choose to teach anyone above elementary school. Plus, if you're teaching public school you could get shot. Just saying.
• You'll need college algebra for basically ANY degree you want to go for. I even needed it when I was looking into a MUSIC degree. If you're going to a community college, it's not a big deal. Test out of it if you can. I tested out of all the lower maths so I could have moved straight to college algebra... Being in AP classes and taking the AP exams allowed me to bypass college English all together... Do know that the tests cost money, so only try to test out of subjects you understand well!

As I said before, I dropped out of a community college, so I'm not exactly a great student... I'll probably go back in a year or so, but I know that I won't get anything out of college if I attend right now. If you think you need some time to examine your life before going to college, that's cool. Depending on your parents' opinions on the subject, I'd highly suggest taking a year off. I'm just now figuring out what I get the most fulfillment out of is computing. I'm learning Python on my own at home. Try out different things before you make the leap into paying for college classes.