one thing to remember
In my first novel I concentrated on a great ending, a rising pace, lots of plot twists, suspense and mystery. I learned one very important thing.
If you have 50 great chapters and open with a so so one, not one agent will read your work.
If you start with 3 great chapters, then coast, people will stick with you for a while. Give 'em 49 great chapters and a sucky ending, they'll tell you what's wrong and ask for a rewrite.
I feel like you have to write your first chapter like the life of your novel depends on it.
I do a lot of reading. It seems like even relatively recently you could get away with a quirky little opening chapter that sets the mood and all, no real action, just some mystery. But for an author starting out today, the first chapter has to sell your work. Not to the reader, but to the agent. With no agent, you have no readers.
It should set the tone, the pace, the stakes/action/problem and introduce, or at least lead into, the main character. It should show off your writing w/o being overwritten.
The answer to your question depends on the genre I think. If it's a thriller you need a thrill, a hero, some action, and a lead in to the plot that implies what your novel is going to be about. Computer crimes, terrorists, serial killers. Typically you have a little action scene that sets the mood. If it's a book about terrorist bombers you have your good guy foiling a terrorist bombing. Now everyone's oriented, and it's off to the races. For more complex novels it can be a bit of a puzzle getting it off the ground.
It doesn't matter if your chapter is short or long. You just have to introduce your story and get everything moving.