Education loans.....Was wondering how it works.....?

I am 43 years old wanting to go back to school for a career change. The last time I went to school I was in my early twenties and I went on a government grant. So, once I apply for loan.....I have to figure out how much total I will need. How is the money disbursed? Will I have to reapply each semester for the classes I will be taking or is it like a construction loan where you get money in draws??