Well for one, I suggest no posting anything until you have something substantial, content-wise. I admire the fact that you are trying to write despite your dyslexia - and apparent young age? - but posting it sentence by sentence here isn't a positive way of gaining feedback, nor is it a successful way to approach the literary craft.
Write a rough draft. I mean a full, complete rough draft. Write a few thousand words if it's going to be a short story, several tens of thousands if it's novella-length, or a hundred thousand on up if you intend for it to be a novel. Then set it aside for a while. Then come back to it and reread it. Fix things up a bit, whether it be flow, content, or grammar; first drafts are never, ever perfect. The second draft is the absolute minimum needed before it is advisable to seek feedback on anything.
Once you've done that, then that's when it might be appropriate to consider sharing it with the world. But when you do, make sure you're clear up front about what you want from those you solicit; whether you want critique, or are merely sharing it for others. Be forewarned, even if you're not positing it for critique, the internet isn't the most pleasant place. Nor is the world of literature, for that matter. It'll be critiqued and criticized anyway. Also, finding a proper way to distribute the piece is an issue all by itself; the formatting, the method of distribution, etc. are all things you should consider more carefully.
Look at this as subtle encouragement! I'm certainly not discouraging a dyslexic writer newbling from finding their footing in the world of writing, but it seems like there are a certain number of minutiae regarding both writing and activity on forums that you seem unaware of. So, I'll leave you with this advice and say: good luck!