Okay well for the intro just start a setting, what your character is doing, perhaps what he wants to do, stuff like that. Here's an example...
Jessica had just arrived in West City, standing near a run down looking motel, if her Intel was right Anthony was residing in that motel, she had to hurry, he never stayed in one place for long. Sure enough a moment later a teenager left the building, black hair, white shirt, denim pants. She approached, calling his name, "Hey Anthony!" The boy looked up, startled, with one look at her, he ran. Jessica attempted to chase but the boy clambered up a fence, tearing his shirt on the barbwire at the top, but still managing to land skillfully onto the ground, and ran deeper into the junk yard, dogs barking and beginning to chase. Stopping at the fence Jessica turned, wondering when she'd catch up with him again...
Of course you wouldn't be able to use two characters unless you made two, but in that post alone I could of started both Anthony and Jessica's stories at the same time. Like I said, setting "Jessica had just arrived in West City, standing near a run down looking motel..." What you character wants to do, in this example it's catch up with Anthony and it's always helpful to have something for Dark to go with at the end, in Anthony's case "clambered up a fence, tearing his shirt on the barbwire at the top, but still managing to land skillfully onto the ground, and ran deeper into the junk yard, dogs barking and beginning to chase."
Hope that helps, if not PM me what your character wants to do and I'll try get something together for you.