As you look towards finally attending college, an important question to answer is how you will afford to pay for it.
There are two main applications that most students who are looking for need based financial aid will fill out:
Many colleges will also offer merit-based aid to award to those incoming students with demonstrated excellence in academics, sports, certain extracurriculars, etc, so always confirm with the college to make sure you know what types of aid they have available.
There are billions of dollars of scholarships offered every year for incoming college freshman (and even college upperclassmen). They can range from ethnic scholarships (i.e. if you have a particular heritage) to a locality (your community, town, or state) to national merit based scholarships (may require a test, essay, or application).