How to run electrical installation in your wooden shed?
There are several ways to install electricity. What we've seen more often are the plugs installed in the floor, near the wall, that way the electrical receptacle box is hidden under the floor. You would cut a rectangular fitted hole in the wood, insert the box underneath and install the plugs.
Another way is to install a waterproof receptacle box (such as this one) on the outside wall and have the outlet anywhere on the wall. See the two photos below. There are multiple outlets, and even the outside sconces, that all go up with the junction box onto the roof. If your lighting fixtures would be on the walls instead of the ceiling, you can have the junction box on the wall and have all the wires meet there.
Ideally, we recommend hiring an electrician any electrical work, since the shed is made of solid wood, faulty wiring may cause a fire.