When you consider the construction of a garage, you need to know what to accomplish first. You cannot simply begin constructing with the part of your choice. This will lead to a faulty and problematic structure when you continue moving on unplanned.
Just like any work you will do, it is better to begin on a plan and move on with the steps in a synchronized movement. In able to finish up your garage in the shortest time possible, you can get the help of online resources so that they can provide the plan that you need. There are free garage plans online that range from the single to the double garage plans; the choice depends on your need, budget and preference. If the space permits it, and if you need to have a bigger space, it would be more logical to have a double garage.