There's a lot that comes down to first reactions. I have on my dating profile (just started a new profile a week ago) 70 visitors/week, 20 conversations and have several dates planned even though my chosen post-JW lifestyle is not going to be monogamous and my profile reflects that. My first date was yesterday with someone who is into my lifestyle as well and we had a great time, even brought her over to my place.
a) Pictures - the cuter the better. Not you being cute (although it helps) but the picture being cute. I have as icon a really cute picture of me and my daughter when she was newborn and even though you can hardly make out my face or even my daughter, it gets so much response. Then I also have a picture of me laughing and another one or two, one is making faces in a swimming pool, but those are less important. Make sure you smile or do something fun and weird in the picture, something that stands out. Don't show off your abs or any other body members, it's not a turn on unless you're a Calvin Klein underwear model (and even then, his pictures are more classy). SMILE and FUN, activities. A picture of you at the convention in your suit, not good. Go here: http://blog.okcupid.com/index.php/my-best-face/ it helped me TREMENDOUSLY, I used their service and reorganized my pictures with instant results.
b) Send a non-short message that explains who you are, your goals etc. even though they may be in your profile. Don't just send a girl "Hi". Make a female profile if you can and see what kind of messages they get and then don't imitate the majority of those. I tried a fake profile and had immediately 10's of messages without even a picture all saying hi and asking for sex.
I have a bit of a boilerplate message myself that explains about me, my hobbies and my job, that I think they're interesting, I fill in what I think is interesting about their profile throughout the message (you have to read it and mention specific or funny stuff) and they should visit my profile to find out more. I would say 40% response rate. If it's thought out and it is geared towards them, women like that. Since it's boilerplate I can cut and paste and in 2 minutes or less send a highly personalized message. If you make it about them they will more readily respond, since my lifestyle is not fitting in everybody's wishes, I do get a lot of "thanks for sending me such a nice thought out message, it's a refreshing change to see that there are still guys like you. I do like that you're honest about your lifestyle but I'm not looking for such relationship", I have about 3 girls that want to keep me as a friend though.
c) Don't let out everything to everyone. Your profile should have some basic information and some extended information on why you're interesting but don't spill all the beans. Especially our pasts as a JW make for a magnificent sob story and nobody wants to hear it (well they do, but not in a first message or some even in a first date). I keep some things an explicitly unrevealed (a witty "well, I would love to tell you more about this but not in public") on my profile and it provokes questions from girls that want to know more.
d) Don't talk about sex or your body's dimensions unless she initiates it. Don't talk about sex in your profile. Don't send sexually tinted first messages. Don't tick off the "casual sex" button. Women are not interested in pure sex (most aren't) and some even have filters on such people so they won't even see you.
e) Be honest and don't brag. Nobody likes sitting in front of fireplaces or long walks on the beach. Those are corny and even if you like them as romantic outings those would not be things you enjoy in every day life.
f) Be witty and intelligent and you can show off slightly if you are intelligent in real life or have a really interesting job but again, don't brag and be honest. It's a huge turn on for most to have someone educated.
Depending on your area you may have lots of available people or not, you won't be able to keep up with all of them anyway and right now I'm struggling to juggle them into real life dates and keeping everyone apart. You also won't get instant results, women have to warm up to you so don't ask them on a date in your second message, talk to them as you would in real life, don't be a creeper.