I'm bored, and I haven't seen one of these threads yet, so I figured I'd post one. Please keep in mind, I'm not doing this to try and make others look stupid, because even I don't have perfect grammar, this is simply to help out.
First of all, at the beginning of every sentence you need a capital letter, no matter what. If it's a new sentence, capitalize it.
Now, there is a difference between your, and you're. You're is You are, so an example would be: You're hot!
Your is used as in possessiveness. Your house is nice.
That's all for now, kiddies. Enjoy this basic and pointless conversation starter!
May I suggest going more in - depth with it? It's kind of short and doesn't really cover anything except one word and capital letters.
Just a suggestion, though.