Designing a spreadsheet

Hello there, I am 15years of age, and have been assigned to design a spreadsheet, can I have the answers to the following please?!
. What vital qualities does a spreadsheet have to follow?
.Do you loike your spreadsheet to be presented as lanscape or portrait?
. What platform do you work from?
. What kinds of costs need to be worked out within a small business i.e Textile industry?
. Is it useful to calculate wasted products?
. What attracts you to use a spreadsheet?