I am 29 and I have played the field. I know that human's really weren't meant to be with one individual but at my age I am ready to stop one nighters and all that and am willing to stick with one girl from now on if she is the right one. I have a bad case of one-itis for this girl Anna I met. She is 10 years younger than me and in school to be a physical therapist. I go to physical therapy because I got fucked up in a car accident recently. She goes with her male "friend" who is actually a quadriplegic! Where I go to therapy I'd heard a lot about her before I even met her and she turned out to be all that others said she was. One look and she had me, hook, line and sinker. I've seen hotter women but she has that something that few other's ever have. I want to be with Ana. Most women tend to find me attractive and she probably does too although looks will only take you so far. Due to the fact that she comes to therapy with this other guy and I don't know how he feels about her (I asked her and she said they were only friends) I was thinking about slipping her a note basically telling her that she stands out in my mind and I would like to get to know her and include my cell # and tell her to text me her # and I will call her. Should I do this? If so what should I say? I was going to say something like:
Hey Anna,
I hope this note finds you well. Since we rarely get a chance to talk I decided to write you. I really would like to get to know you better but we don't have much time to talk during therapy and you are usually with Joemama. Here is my cell #(123)321-3232, text me with your # if you want and I will call you. If nothing else at least I can make a new friend which is 1 more than I have in this new city lol.
Any Advice?

You inquired about her friend, but you have not talked to her much beyond that? How do you know you are interested in her? Or that you two will be compatible? Or that she has traits you are looking for?

You need to open her and produce conversation before you should even be thinking of a note like that. You have to interact with her before you can do anything else. If you are that strong in your ideas for this woman, you will be able to find time to approach.