I got suckered into the 12k shed plans, only to find myself falling for one of the oldest scammer sales pitches in the book by being up-sold into the add-ons. Before I clicked I did a quick review and the first few sites that popped up had said that it was worth the money to buy the add-on because that is where the real value was (perhaps a review page planted by the good folks of MyShedPlans).
When you’ve decided on a shed location, dig two trenches 16 in. wide, 12 in. deep and 13 ft. long. Center the trenches 66 in. apart. Fill the trenches with a 3-in. layer of gravel and compact it with a hand tamper. Repeat this process until the trench is full. Use a level and long board to level the top layer of gravel. If the ground is flat, also make sure the gravel beds in the two trenches are level with each other.
Build the framework for all four walls. To account for the fact that the front and back walls are different from each other (due to the doorframe in the front) and the side walls must both be sloped (to prevent rain from collecting on the roof), each of these will have to be tackled somewhat differently. It’s easiest to construct the back first, the front second, and the two sides last, as shown in the numbered image below. See How to Frame a Wall for more information before you read the instructions below.