Heya! New here, saw your post... It is AWESOME that you want to write a story!
Here are three tiny (but important) tips.
Tip#1 - Write. Anything. Always.
You will write stuff that suck. You will leave them be and just keep writing... THEN you will come back to them and rewrite them, until you like what you see.
Tip#2 - Focus on the likes.
There will be furries who will like your story.
There will be furries who will strongly dislike your story.
There will be furries who will offer strong, unasked for, critique for your story.
Focus on the likes, while keeping an open ear to the critiques. They might help.
Tip#3 - Find an editor.
A friend or a forum member, someone who likes your work, should offer a fresh perspective on the plot and characters, while noticing/correcting grammar and punctuation errors. We all make 'em, hehe.
Hope this helps! Can't wait to see what you write!