Put it down on paper. Until you have it in black and white you really can't see it.
Here are some ideas:
Describe the location, the time of day, the season, inside, outside, a house, a business, a street, a pasture....
Describe the character: Age, short, tall, weight, age, ethnicity, education, morality, fashion sense.
While the idea of putting it down on paper seems a no-brainer, this is where I find clarity. What made perfect sense in my head requires far more detail to capture it on paper. And if I can describe it on paper, I can't shoot it. It's really that simple.
I focus on the characters. As the story develops, I create more and more backstory to solidify the character's motivation. It's not enough for me to have the character do something, I have to understand why they're doing it. Even if I don't tell the audience why they're doing it, by me understanding WHY they do something, it will drive HOW they do something, and it's in the action of HOW that the audience can get at least an taste for WHO this character is.
Right, so I'm new to this kinda thing and I'm really excited to start filming short films.
First I was wondering how to write. I get that you need an idea to write and I've got quite a few, but as for the actual writing, I've no idea how to start.
Any help?