Having done all this, I'm not sure I'd do it this way again. It might well be faster to layout the positions with compass and straightedge directly onto the top. Either way, you'll want to use a scribe rather than a pencil. Scribe lines are hard to see, and impossible to photograph, but the scribe and compass points click into them, allowing a precision that pencils simply cannot match.
A shed is a great project to earn your sawdust legs on. It is just some very basic carpentry skills. You could build the whole thing with a circular saw, hammer, utility knife, pencil, and tape rule. Find a friend or relative that has some decent skills to help. You could do it in a weekend. Keep the size on a four foot increment to minimize wastee. I would recommend a 12 x 12 or a 12 x 16 if you can. If you don't want to cut any rafters (which is really a simple process), you can order small triangle shaped trusses for the roof from your local lumberyard. If you are using T1-11 for the sides, get the real plywood based stuff, no waferboard. Same thing for the floor, use plywood (treated if you like). Cedar for the trim, not pine. The visqueen underneath is a good idea. Insulate the walls inside to help temper temperature swings. Build overhanges into the roof all the way around, 12" is nice. These really are a fun project. You can add a small window with a flower box underneath to make it look a little homey too.
When you're working with linseed oil, never -- I mean NEVER -- leave used rags lying around. Hang them up outside, away from anything combustible, and where there's enough air circulation to keep them cool. Or put them in a bucket of water, and hang them outside later. If you're just setting a rag down for the moment, set it out flat, without folds, on something non-flammable. Hanging outside in the breeze, the oil in the rags won't retain heat while they oxidize. For the oil to completely oxidize can take in a couple of days, if it's warm, or more than a week, if it's cold and rainy. When fully oxidized, the oil will be solid and the rags will be stiff. At that point, they're safe, and can be thrown in the trash. Toss them in the trash before that, and you might as well say goodbye to your garage.
I agree that I might quickly outgrow a 12x8 shed. Lowes also offers a 12x10 Rancher (same style, but more room), but the 12x10 is 9 feet, 4 inches high, and my community only allows a maximum height of 9 feet. The 12x8 is exactly 9 feet high. I'm afraid of getting "out of spec" if I exceed the height limit and then getting in trouble with the Home Owner's Association. Having said that, 12x10 would be about the biggest size I could get for the available area in my back yard, so even if I hire a shed contractor to do this, the shed would have to be 12x10 or smaller.
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First, cut one long edge. Second, cut a short edge, making sure it's square to the long edge you just cut. Clamp both pieces of the edging you'll be using along the long edge you've cut, and measure the width of the base plus 1/4-1/2", mark that, and then lay out a line through the mark that is square to the end you've cut, then cut along the line. Finally, cut the remaining short edge square to both long edges. (The length of the top doesn't need to precisely match anything, so we don't need to bother with clamping the trim before measuring.)
Yea I had a friend who went the HD route and in after putting new braces up for the roof and an extra layer of plywood on the floor he gave up the fight and tore it down. We ended up building twice the shed that was 100 times more sturdy for less than he had invested in the first one. I would go any route that is the opposite way of HD or Lowes. Learn from this guy.
The base needs to be as wide as the sum of width of the guide strip and the distance from the edge of the shoe, plus a bit extra, With my saw, the overhang is 3-1/2", so I made my guide strip 5-1/2" wide. The distance between from the edge of the shoe to the blade is about 4-1/2", so the base needs to be at least 10" wide. Since I was working with a 24" wide sheet, I just sliced it down the middle.