Hello again Amy.
Did you manage to find a challenge that you might want to try? If so you can just take screenshots and then add words to them as you go. If you can't think of a story you could just write little notes such as 'Amy's simself purchased a house/lot in Willow Creek/Oasis Springs' followed by an introduction - her traits, aspirations, why she's new in town depending on the challenge. Notes work great so you can go back to them and expand on what else went on during a scene - Amy went to the gym to meet new people, find a spouse, begin a healthy lifestyle etc.
You could give her/him traits and aspirations you don't usually go for, I found the Chief Of Mischief to be a lot of fun as I don't often play mischievous Sims.