First and foremost thank you for taking the time to read this.
On first contact, I would suggest you use the following format to me or any provider you contact. Even if you just create it or just cut and paste it to any new provider start with this format it will go a long way.
Hi XXXX
This is XXXX from XXX Board / Site. I saw your profile and was wondering if you are available at XXXX time, I have some references attached to my profile I can PM you if needed me to. I am a XXXX male XXXX YO and looking to spend XXXX amount of time with you is that possible?
Following this format gets most your info out right away lets any provider see that you are prepared and lowers her time and legwork researching you out. Making for a much faster response and booking time. And in the end a much happier experience