I wanna pay in full for my first apartment what are all the things I need to know and do I have to put down a downpayment on the

Do I have to still put down a down payment or whatever its called if I want to pay in full for the year? I want to move out asap will I have any additional fee's I've never rented an apartment before? If I pay the landlord in full do I still need to give him my social and credit score? Anything else I need to know