First chapters are always fun for me.
I love setting up the story and creating some juicy conflict.
One thing I try to keep in mind is that I start the story right. There's a lot of advice to start the story with action, which is great, but I also think there's another important aspect to the first chapter and it has to do with character arc.
The first chapter should start with your main character in their ordinary world. This is the world they've been in before the story started. The same problems, the same people, the same moral structure.
Somewhere in chapter one, usually toward the end, something happens or some choice is made which propels the main character into a new world. A new job, a new challenge, or maybe new choices.
This change that occurs should be something that challenges your hero or heroine's character.
Thus, the character arc begins and chapter one ends with your main character in a struggle that will continue throughout the story and at the end of the book, your main character should be somehow different or changed from who he or she was at the beginning of the story.
What happens to your main character in chapter one that will forever change him or her? Who is your favorite hero or heroine and how is he or she different at the end of the story?