Call the school you're planning on attending and find out how much their tuition and fees are (or check their website). For example, my school's charges roughly $2100 per semester in tuition. Assuming you graduate in four years (8 semesters), that adds up to a little over $12,200.00 Books are another big expensive to factor in.
Here's a website with a little calculator that you can perhaps figure out how much financial aid you might qualify for.
You have to punch in things like the number of family members, amount of income, yearly tuition/fees.
It basically works like this... Based on income, number of family members, and cost of tuition/fees, you are given an EFC (estimated family contribution). That's the amount that your family/yourself is expected to contribute to your college costs.
Let's say that per semester your tuition was $2000 and your EFC was $500. That qualifies you for $1500 in federal financial aid (max Pell per semester is around $2000).
That might have been confusing, but hope it helps. Good luck!