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My first DMing experience was Star Wars Saga. I was hesitant to DM anything in the traditional D&D family line as I didn't feel familiar enough with the base setting material, but luckily I had plenty of Star Wars knowledge from years of reading EU books and what not. Soooo I semi winged an alternate original trilogy timeline campaign that then branched into another more related campaign, technically still have the notes for a closing 3rd chapter.
I now do the same thing in Pathfinder but fake the setting too! I pick a theme and build a couple villians/major plots around them then wing everything in between. Sometimes jam it right into Golarion somewhere or just use most of the trapping but make a quick one off world. I'll do a quick major events/ecounters outline and then thumb through the MMs to bookmark monsters that fit appropriately for random events or w/e the PCs get stuck. After that it's just a matter of tricking errr I mean letting the players help flesh out all the details of getting from A to B by playing.