first of all if you're going to write her a letter try to not write it in txt talk. that is so annoying and a bit immature, unless of course you are texting her but thats a bit cr@p too. Just tell her face to face, dont tell her you love her as that may be a bit too soon or forward just say you think you're falling for her
if you want people to answer this who may have more experience of life than you do then i suggest that you write in a readable way. many will see your random letters and then move onto something that is written in a better format.
Although, saying that, the kids will all be home from schools about now and they may well be able to read it and reply in the same way.