I need help seting up a spreadsheet(s) to track Layaway payments for my store.

I would like to record information about the customer and the order of
course. Also, some customers may have several orders in layaway.

I also need to track deposit, payments with the date, amount owed, date
contract started, date order delivered and picked up, etc.

I also eventually would like to track things like length of payment period,
weekly, monthly, yearly totals, etc.

Could someone please help me to layout a spreadsheet to do all that. I have
tried unsuccesfully to set up several permutations, but nothing seems to work
very well.

Thanks in advance