As for ending and branches...
CYS stories are insane when it comes to branching and stories.
This article, if you haven't read it yet, highlights a few of the issue with paths and stories here. These really are different and can get crazy quickly. I have
one story here that has 16,000 words but because of paths any one-time through the story will only see 3,000 words -- and that one only has one ending!
You also asked what people like here. As you might imagine, every person will give you a different answer. In general, people really don't like very short stories, stories without choices, and stories that are just poorly written. Beyond that, you need to write for what you like to write. If you try to write to get high ratings here, you're going to spend a lot of time just trying to please others. If you want to go down that road, go ahead, but it's not easy.
Yes, more endings is certainly fun. Having a number of different endings and making many paths to those ending can be rewarding -- but this will require a lot of work and a lot of planning for it to make sense. In addition, you have to prepare yourself for the idea that people simply aren't going to read most of your story because of the paths! Also, beware of fake choices -- choices that don't have any effect, don't add to the story, and end up leading back to where you started. That and insta-death choices without any warning aren't that much fun, either.
Feel free to keep asking questions about anything! Post ideas, thoughts, and other things, there are some here that will give you feedback (though it might take a few days sometimes). Good luck!