I have spent a truckload of time on the same for five years by purchasing and reading Woodworking books, going through woodworking plan blueprints and understanding woodworking designs. While some of them are very detailed most of them left with questions more than answers because of the incompetency and inadequacy in the design details. I haven’t come across a single plan that had everything I needed, forget the step by step instructions.
You can build the walls on any flat surface, but the shed platform is ideal. Snap chalk lines on the plywood deck, 3-1/2 in. from the edges of the platform, to indicate the inside edge of the walls. Measure to make sure the lines are parallel and 89 in. apart. Then chalk a line down the center (Photo 1). You’ll use this line to make sure the angled top plates meet in the center. 

It can be easy to get excited and overestimate your DIY abilities when you start a new project. The passion and excitement makes you want to dream big and get creative. But blindly following your imagination can be a step in the wrong direction. If you’re a newbie to DIY woodworking, then you’ll probably want to keep it simple. Otherwise you run the real risk of ending up with a sub par build or even having to rebuild it altogether.
A thing you might want to check is if regulations require a minimum setback from the property line. This is often overlooked and come back to bite you. A silly thing I found out when I built my shed, my jurisdiction in California treats buildings differently depending on what they are called on the permit. I called my shed a barn because I built a gambrel roof and it looked like a barn. My surprise....A barn must be 50 feet away from any structures occupied by humans. A shed can be almost against the house.....same size, same shape,,,just different names.

Working from ladders is more dangerous than working from scaffolding. Plus, having to constantly move ladders around is time consuming. When you get to the roof construction, consider renting a set of scaffolding with wheels. You’ll be amazed at how much easier it is to have a stable platform to work from and to set your tools and materials on. You can rent a 5-ft.-tall section of scaffold with three planks and wheels for about $110 per week.

DIY Shed Plans