One or two revelations would be enough for starters (remember that you can always devise more in the future). The rule of thumb is: the more detailed and the less sensible a revelation—the better. The more absurd the details, the less questions you will be asked. Don't be shy, unleash your subconsciousness: after all, it's not what you think of, it's what your God reveals to you.
Now, enter the freshly created God. The only thing that must be present in your revelation is the God appointing you His prophet. In fact, from now on you will not need this supreme creature that much.
While designing and developing a revelation, use modern realia liberally: insert repenting terrorists, miracles of shrinking gas bills, Ascension of Jaguar X-type or a pop star burning but not consumed. Let your visions be hip and sexy. Mention some music that you heard while in the God's presence—this will let you sell the Original Vision Soundtrack later.