One thing that is constantly being hammered home to me about writing...

The most important thing about writing is having something worth writing about. Content.

The next most important thing about good (sorry, gnu, but it's an adjective modifying a noun) writing is knowing how to make the writing as transparent as possible. If you don't know the rules of grammar well enough to accomplish this (I usually don't), then you better have some other really good rule-breakers that folks find enjoyable.

Finally, if you don't have content that's worth writing about, then you need to have a few good tricks up your sleeve to make a silk purse out of the sow's ear you've been handed.

I've read some pretty good silk purses that began their lives as sow's ears.