You can also first visit our recommended agencies that you can find in this topic.
Write a detailed introduction letter (preferable translated in Russian), to receive a detailed reply of the woman If you write your Russian lady for the first (introduction letter) time, please write a detailed letter about yourself.
You will learn more about the Russian-women- dating-world in common.
Being prepared is being halfway your success in finding you Russian lady.
Another important thing is to confirm with her if your (original) letters indeed are reaching her.
Try to send copies of your original letters using postal mail or a fax machine at her office (if possible) and ask her if these letters are the same she received through the Dating Agency you are using.
I know examples that some Dating Agencies, with this kind of services, can create additional questions or add more text to your letters or even change your letters, just for the reason to keep you as long as possible as their customer.
Try to find out if her letters to you are very personal and don't look like standard generated letters.
Persons who are just trying to get your money are using pre-defined letters, just because they don't have the time to write each person in a personal way.