The following is my own advice, as i'm not a famous author you can either trust my judgement or throw it away completely, your choice, but hear what I say before you judge it, although my movellas aren't that good.
You probably have an idea for your characters how they look and behave, but you should also make the audience love/hate these characters the way you do. So how do you make the audience interested?
I'm no expert, but it would be the characters that entertain the audience and make them interested.
If you want a good character always plan.
2. Appearance --> this is so you know how to describe your character in your story - generally people describe the face more than anything else and that's where you should focus on.
3. Personality --> this is where you bring your character to life - the audience doesn't like characters that are perfect, they all share the same personality - you need to know what makes your character unique, is he/she determined, strong-willed, dreamer, brave, smart, etc. don't chose all
4. Flaws - This is one of the most important parts - your characters need flaws to entertain the audience, and how they struggle with their flaws as the story progresses - flaws can be fears (of spiders, heights, snakes, dark, etc.), emotional (temperamental, soft-hearted, callous, etc.), physical (sick, dying, old, etc.), others (nightmares, curses/spells, etc.).
5. Growth - this is how the character grows over time - this is how they overcome fears, become stronger, learn to deal with their flaws, basically becoming better people
6. What is their purpose - their drive to succeed or their goal
7. When you reach this stage you already have imagined your character in different situations, write the situations even if they don't match the story, the more you know the character the more you're able to write
8. What have challenged the character - their past and how it created the fears and the drive, what was the downs of their life, -death of friends/relatives, what makes them human
9. Get feedback on your character and how they fit in the story, - this is how you know people would react to the character, they will judge it and be open to the feedback
Tips when writing:
- Don't just focus on recounting a set of events make sure your bonding the characters with the audience that is describe the characters, feelings, emotions, responses to different situations
- Remember if you add too much detail the story slows down and can bore the audience, less detail speeds it up and entertains the audience. To control the speed, you control the amount of detail. Slow motion = more detail, Fast = less
- Don't stick to just sight, remember the character can hear, smell, taste and feel things,
- Edit, always edit, and ask for feedback,
- The character's mind isn't empty, you can talk about what they're thinking, ideas/memories, but do it by showing the character's response to the words in his head, he might be angry or upset, etc.
- Don't get carried away, too much of something can be a bad thing, find a balance between everything
- Avoid repeating sentences or repeating what you say in a different way - always look back
- Do you really need that - if not just cut it out, Quality over Quantity
- Be patient and let the ideas come,
Well this is just my opinion, it may not even be right, but this is what i think at the moment is right.