Break it down into smaller tasks so you're not so overwhelmed by what you're doing. Think about: what do you have to do to get in? Probably take a look at your grades and your portfolio first before applying so you don't waste your time and money. How much is it going to be? How much are you going to be able to get through your own savings, parents, grants, scholarships, government loans? How do you apply for those? You'll probably have to write a few essays for the grants or scholarships, so brush up on your writing skills. Government loans will probably need information like your social security number, your parent's income tax if you're still living with them, how far you're moving, what program you're taking, etc. Do you need to apply for residence? Is that a seperate application? Is there a work-study program or another employment program to help low-income students? Are there requirements to be allowed into the program?
When I was applying for school, I found the most helpful things were to write down a list of dates (it helps give you a chronology for which of the many tasks to do first) and to get an adult who has been to school already to help me out. Even if you can't find an adult who's been to school, a regular adult will be helpful anyways to decipher all the bureaucratic lexicon. Don't be afraid to e-mail the school or call up whatever government department you're dealing with to get help, too. It's their job to walk people through this kind of things, and no question is too stupid.