Helpful Writing Advice

1) Read a lot! The more you read, the more you can understand what books will sell the best. Also, It can improve your vocabulary and writing styles.
2) Be original! Try to do a new idea. Nobody wants to read a story they have already read before. Think outside the box and have fun. 
3) Make sure your story makes sense. If you reread your story and realize you don't understand what you just wrote, that's probably going to mean the reader won't either. Also, be wary of any inside information or jokes nobody else will get. 
4) Don't make your stories predictable. That is one thing I can't handle as a reader. It's no fun knowing the whole story within the first chapter. throw curveballs. Maybe she doesn't end up with him. Make a beloved character die every once and a while, it will be okay.
5) Vocab! It's important you sound intelligent when you write, or not many people will pay attention. I can't help but notice (I don't want to offend anybody, so please don't take this the wrong way) that older, classic books have higher reading levels. I read a label that said Twilight was a fourth-grade reading level. To help me write, I often read super challenging books. If you are still confused, I would recommend reading Jules Verne. 
6) Don't edit as you write! If you constantly change stuff, you may get confused easily, I've done it before. You can always go back and change stuff when you're finished. 
7) Be relatable as you write. It helps to include stuff the reader agrees with. If you don't do this, the reader could get bored or have no idea what you're talking about.
8) Cliffhangers, people! A good way to make money is to involve cliffhangers. The reader will have to read the next book if you leave them with an intense plot twist. Goes along with the whole be unpredictable thing. 
9) Be sure to use a lot of detail. I struggle with this too, so I'm also talking to myself here. If you use details, the reader can better picture the scenery and characters. Many of my classmates complain that they can't picture what they're reading in their head. With this being said, don't use too much either or the reader will get bored. 
10) Involve lots of action in your book. If it is boring, nobody will want to read it. Sadly, the attention spans of this generation are growing shorter and shorter. If you want your work to interest your peers, try using some battles or near death experiences to keep the reader involved alert. 
11) Create a bond between the character and the reader. To do this, try voicing the characters opinions or weaknesses that make him sound vulnerable. Try having him get injured. A quick way to make money is through doing this. Just like cliffhangers, people will want more. How do you think J.K. Rowling got so famous?