I'm certainly not one of the big-name story hour authors, but I'll add my two cents anyway.
Some people keep notes, some don't. I don't keep any notes - I seem to have a good memory for what happened in my D&D games, even if I can't remember my anniversary. But, if you have trouble remembering, then sure, jot down some notes. And if you don't get all the details straight, you can embellish as you write the story hour. No one is going to know or care if your story hour is 100% accurate to what happened in the game.
I think another piece of good advice is not to begin your story hour until you have several sessions (~6) in the bag. That way you have plenty to draw on as you get ramped up.
Remember that the most important thing for a story hour is consistent updates. If you update consistently and your story is even a tiny bit interesting, you will have regular readers.
Finally, ignore page views. Seriously. Write the story hour because you want to - as a campaign log, for your own amusement, or whatever. Don't write it because you are seeking fame and fortune.
Have fun!