Help with my teaching career?

[cameron.]

So, i've decided (and i'm definitely solid on this idea) i'm going to become a teacher.
The problem is, i don't know which grade level i'd like best.
I've been leaning toward kindergarten, but then first grade has also been a close contender.
I also have been thinking about day-care/pre-school.

What i'm asking is: What are the upsides and downsides of teaching kindergarten, first grade, preschool, or running a daycare?
What should i consider in making my decision?

*note- i'm only a junior in highschool... so this is decision doesn't have to be rushed.
but i would like to get some sort of idea soon, so i cant start looking at colleges with the major i choose.