Grammar first then story?
You have to walk before you can run. You have to master counting before you tackle fractions. Likewise, you need to have a good command of the technical details before you work on the story. I could discuss the plot and characterization and style, but that would only complicate matters. And I'd prefer you went slowly and mastered the technical stuff before we went into the creative part of the story.
EDIT: I already know the dialog punctuation. and I very well know how to spell and I know grammar, but the problem is you pointed out errors that I didn't see(not your fault).
If there are many errors that you don't see (but which we do), then your story can only benefit from your slowing down and being careful while editing. Whether the mistakes are due to inexperience with the craft or due to haste in posting the excerpt, it turns readers off. And it looks careless. Most critiquers aren't going to spend time on a piece if it looks as though the author didn't.
Good luck with improving your skills!