Getting ready for my trip!

Hi all, I’m in the process of getting ready for my first Disney world trip as an adult. I haven’t been since I was super young, and I’m a bit overwhelmed in preparing to go. I was wondering if I could get some tips to prepare for a week, what to bring that I wouldn’t think of, what not to bring, Is there a reasonable grocery store nearby, how does the meal plan work, etc. I’m staying in the All Sports resort for a week in the beginning of March.

I really appreciate any and all tips or info in advanced.