The first things you need to know is;
Do you need a permit for this shed?Are you limited on what size you can build?where can you place it on your lot, (are there setbacks)?
I am currently making a shed "go away" because of lot coverage and another will probably have to be moved back about 3'(this will be a very expensive lesson because it is on a pored foundation.)
Your neighbors will call, they always do!!!
Find out the answers to these questions first, then you should read some books on shed design and construction like "SHEDS 1-2-3" from Home Depot.
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