Now, I can't help every problem. There are many problems I am not capable of fixing, but the best advice I can give you is, go to the books.
Books hold all of the grammar secrets any writer can use. As suggested previously, take a highlighter to an old book. You can solve virtually any problem by looking in old books.
I also have an alternative option. Below are links to my books published on Wattpad. On Wattpad, you can reach me for any questions you need, which I will answer to the best of my ability.
Here is a link to my book, 'Not Like You,' on Wattpad
Here is a link to My book, 'The Big Picture,' on Wattpad
here is a link to the worst book I have ever written called ' B E A U T I F U L,'
Here is a link to my profile of wattpad, 'bellabee982265'
And, in case you are having trouble starting your book, here is a link to a random generator website
This is my upcoming book under edits, so look out for this cover.