Assalamualaikum :)
You want tips to write a book? Well I can't say I'm a pro at it but here are a few things that I follow:
- As soon as you get a story idea to start off, don't jump with it. What I mean is, some people just start writing stories when they get ideas initially but don't know how to take it forward later. Put down those ideas in a paper/laptop, write what you get in mind and through them go on to plan your entire story plot. Once you have the framework set out, start building on it
-Use proper grammar. It's okay if you don't proof read your stories and they have a "few" errors but when there are too many, they just can't be avoided and it's annoying to read
-Choose a good title and make sure that it is apt for your story
-Another important thing is to space your paragraphs, it becomes easier to read
-Using stuffs that the readers can connect to makes your story interesting to read
-Adding a little bit of suspense at the right time works well
-Lastly, when you are posting on wattpad don't feel low depending on the votes and comments your story receives. There are people who won't vote and comment even if they like it but if you believe that your story is good, then give it some time and go on writing.
I hope this helps you out :)