when it comes to writing, the best thing you can do is write everything down. once you've gotten a basic idea down on paper you can stop worrying about trying to remember it and you can dwell on new ideas. If you're looking for inspiration, you just have to try and find to times and places that inspire you. I get a lot of creative buzz from long walks and strangely enough, when I'm in the shower. when it comes to filling in missing scenes, improvise. come up with little quirks, character relations, side stories, plot development, character development, anything, just freewrite it all. you can't expect to come up with a fully formed story immeadiatly, or even once you begin. sometimes you just have to knuckle down and keep going, even if you don't know where you're headed. Don't expect it to be a work of art, expect it to be s**t, then, with time and percerverence, you'll improve as a writer and so will your work. you cant' create soemthign worthwhile without first being an absolute novice beforehand.