Not an expert here, but from what I understand, gasoline "goes bad" because it oxidizes in contact with air. Its rate of oxidation is relatively slow, but it is temperature dependent. So, if you store the car in a warm garage, the fuel is more likely to "go sour" than if you store your car in a cold garage. And, the more surface area you allow in contact with the fuel, the greater the rate at which the fuel decomposes.
So, to avoid the condensation problem, and to reduce the deterioration of your fuel, it stands to reason that the best bet is to fill your tank all the way to the very top before storage. As an added measure, it helps to add a fuel stabilizer.
As for oiling the cylinders before starting--again, not an expert here, but most lubricants have a certain characteristics allowing them to act as a solvent, as well as characteristics which allow them to act as abeing a lubricant. These solvent characteristics may generally also be called penetration (or penetrant) characteristics). WD-40 is a well known penetrant lubricant. It is able to flow and penetrate into areas that a 50-weight would only dream of. But even though it may excel at penetration, it's lubricating capabilities are lacking, with respect to a standard motor oil.
So, I would assert that possibly both WD-40 and a motor oil would be an appropriate start-up regime. If I were starting up a car which had been sitting (and I've got four in storage for more than 15 years which were not properly stored in the first place) I would probably use WD-40 first, then add oil.