I feel ya my first period I had to was my sheets four times in one week because of overwhelming amounts of blood and then went through one tampon for about every two hours for that week and the one after that. Not to mention how many loads of laundry of just my undies I had. Everything is compel early normal so just be prepared.
Because it's your period and it's most likely irregular so one day it might be really heavy and then the next day light. I would suggest you would wear heavy/overnight pads at night and see how bad it is in the morning and then choose what kind obsencey to use.