For the beginning questions, you should be able to answer. Is there something in particular you don't understand or don't know how to do? First, be sure you know the deadline to send in the application. You should send in your application before or by that deadline, depending on what the school says. A lot of schools require you to send a check along for the admissions fee, so check that out to see how much you're going to have to send to the school. Some schools may require you to ask for a teacher's recommendation. It depends on what school it is. Some schools will want none, one, or two. So depending on the number, ask some of the teachers that really got to know you and seen you work, and give them about two weeks to write you one. The colleges might also require you to give the teacher an envelope and stamp of the school's address or the teacher can provide the envelope and stamp, but might want the school's address to send it. Some schools will also ask you to write an essay or more. Just try to write a good essay.
While you're doing this, you should do what some of the other people have said before me, like college visits to make sure you really like the environment and apply for scholarships. Best of luck to you!