I'm going into teaching High School as well.
I have one year left. So far I have just done a few field experiences and won't do my student teaching until next spring. I'll be teaching high school English when I finish, and I can't wait.
I couldn't agree more with the notion that you really should love it if you're going to do it. Parents, school boards, politicians, adminstration, and even some students themselves can make it a nightmare.
I have to bristle at what a few people have said, that teaching high school is a nightmare. That's your opinon of course, and you are welcome to it, but that's really a shame. And I would have to ask each of those posters how many high schoolers they know...and I mean REALLY know. (And no your own children don't count. The parent child dynamic can skew perceptions about an age group (from both ends).) I have found most are thoughtful, and concerned with a lot of the same things and worried about the same problems as adults, they just lack the social tools to deal with it.
Teaching is not for everyone.
My advice to you. If you want to do it, bio is a better option than history because the social studies field is usually overflowing and securing ajob would be tough. Bio is crying out for teachers and usually they give pretty good incentives (when school districts can afford to do so) for bio teachers.
I have to say your comment about money set me back to. If you want to make money--this isn't the career path for you. Most starting teachers make 20-25,000. By the time you retire you can expect to make 45,000.
I would suggest you get in a mentoring our tutoring program. Schools love volunteers. Try your hand at maybe some summer school programs. See how you feel about it before you make your choice. I know it's not a glamourous job, and I know that nine times out of ten it is a thankless job, however that one percent can be so gratifying...and so mood altering! The high you get from watching someone's "light bulb" turn on, when they finally get it, and it's because you helped them...there aren't even words to describe it. You might get paid more to watch cells divide in a petry dish, but I doubt the same thrill is there...tho maybe it is. You really do have to find what will be a good fit for you.
Once you choose to become a teacher, I will be more than happy to give you loads more of advice, links, and resources that have been a HUGE help to me.