I do prep lists by station. Each station should have its own prep list with every item that needs to be prepped and set up on the station on that list.
The top of your list should show what station the list is for and have blank spaces to fill in the "date", the "day of week", and the "employee name".
The body of your list should consist of 8 columns. These columns are: ingredient, amount on hand, par levels - sun. thru thur. (or whatever your slower days of week are), par levels - fri & sat (busy days), amount to prep, shelf life, utensil (for portioning), comments (for extra prep instructions).
The kitchen manager or chef creates the prep lists and sets the par levels for every item on every station, adding in the prep for the day on features. The employee running that station does the math and figures out how much to prep. Until they have mastered prep, the employee should be getting their prep lists every shift, filling them out, prepping, then signing and turning them in to the KM or chef. The KM or chef should be inspecting every employee's prep including verifying they have the right utensil to properly portion every item, every shift until the employee has proven themself, then should still inspect it randomly on occasion. This is a good time for them also to verify that coolers are clean and at temp and all prep containers are dated and rotated.
Preparing for a shift is 90% of the battle of running a successful service. Prepping should be given the appropriate level of attention to make sure service goes smooth.
You should consider joining RestaurantOwner.com. They have organizational tools like prep and cleaning lists available for download for members. Using a template would save you a ton of time over creating your own spreadsheets from scratch.