Need help with packing one bag for every day life

Hi all,

I am new to one bag living. I am a college student who will be moving into a very very small space in a few weeks, essentially just a closet (not a dorm) and will have to live out of a duffel bag, a backpack, and a purse for four months. I don't know where to start or what to bring. I already know I'll bring a week's worth of clothes (I don't mind doing laundry every week), my laptop, journal, planner/notebook, and some knitting supplies as well as toiletries and cooking supplies. I don't know what else to bring or how to pack everything—I am horrible at packing and organizing. Can I have some tips and tricks? Thank you.