The biggest hurdle for The Bartender is housing all of the components. In order to really get started, you'll need to purchase a 4' x 8' sheet of 1/2" MDF, and use a circular saw or a table saw to cut it to the correct size. An easy way to hop over to CutListOptimizer and upload the Cut List, which will give you an idea of the exact cuts you'll have to make.

To assemble, reference the 3D Model to determine which parts go where, but the labels make it easier to figure out. The hinges required are also in the parts list, and you'll want to paint your frame at this stage as well, while there's nothing in it yet.