A number of my clients have felt at a disadvantage when using traditional online dating sites. To sum up their difficulty I'd say that it has to do with the challenge of conveying a large amount of visual and textual information that can then be "used against you" before you've had a fair chance to talk and put it into perspective.
If you think that you're not getting enough "hits" using traditional online dating sites then I highly recommend the Tinder app for your tablet or smartphone. A number of my clients have gotten very good results from it, and it appears to be a superior and more natural way to "lead off" the process.
Tinder's design seems to dovetail nicely with the casual way that people like to interact online—for example emphasizing messaging over lengthier emails—and facilitates interactions in a way that's fun. Essentially you view pictures and a very brief description, and you can indicate that you are "interested." If two people are interested in each other then they are allowed to send messages.
This app removes a lot of heaviness to the process and provides for a more natural ice breaker; it also more closely resembles how people actually meet in larger gatherings. (I saw her from across the room! And my heart went "boom"!) If there's still interest after messaging for a while then you can check out each others' lengthier profiles on other dating sites or move right into that initial coffee meeting.