John kidnaps Lilith? Sounds fun. How about there be a ransom to find Lilith and bring her home, as Lilith gets taken home, John thinks?,"let's take a detour and kill Bill on our way there." And it gets to the point that Lilith doesn't want to go home anymore.

Be sure to keep John and Lilith's personality diverse, banter between characters are always a good excuse for humor. I suggest drawing inspiration from two characters you like and imagining what it would be like if they were forced to travel together. "What if Cloud Strife was required to escort Jade from Jackie Chan adventures across the country?"

As for those scenes in your head, WRITE THEM THE FUCK DOWN. It's best to write them while they're fresh in you mind and your excited to write them. Then just save hem into a folder and woop it out for when your story is ready for that part.

John works with Bill after a madman handcuffs them together while there's a hit on both their heads. The corrupt governor doesn't want them revealing some of the crimes he's done. There's a chest Lillith stole that contains all the forged signatures from Mexico to Texas, John and Bill have to find other Sheriffs that are willing to bring the governor to justice.

Lillian meets a girl that's as old as her. The girl is African and is about to be sold off to slavery. Lilith begs John to help her, even though John's general ideology is "not my problem, not gonna help."