Either you look like a model or you're making it up. What type of conversation do you usually start with?
Neither. I'm 6'1" and around 250lbs but decently muscular and you wouldn't describe me as fat (although I am overweight). Above average looking but far from a model. I'm on Tinder (crap), Bumble (great), Plenty of Fish (great), and Coffee Meets Bagel (just okay). I live in the greater Pittsburgh area so the amount of women around is higher than average. Now let me be clear here, these women are not great looking. They are pretty average. But given my situation, I'll take what I can get until I'm ready for a real relationship.
3 of the 4, I had sex with the first time I met them. The other took 3 dates. My general rule is if I think there is something there and there is potential for a relationship, I won't be the first to bring up sex. If not, then I'll playfully load up the conversation with innuendo until they do then take it from there.
Some general rules I've found to be successful
1. Never start with just a "Hi", "Hey, how are you", etc. If you can make them laugh to start it off, they'll respond. Be goofy, irreverent, or playful. If they smile and think "WTF??" on your first message, you're off to a good start.
2. Be willing to talk about anything but don't bring up certain topics. I avoid politics, religion, sex, and the fact that I am getting a divorce. But if they bring it up, I'll engage.
3. Ask them what they are looking for. If you get a "I'm just taking it one step at a time" line or something of the like, that usually means they are looking to fuck.
4. When they ask you the same, the best answer is that your looking for someone you have a connection with. Someone you can be friends with first that eventually develops into a relationship. They don't want someone just looking to fuck.
5. Ask them about themselves. Don't just talk about yourself. If they have something written in their bio, tailor a few questions to it. Work isn't exciting so try common interests; something where you can keep up your end of the conversation. I use "beer, wine, or liquor?" a lot once the conversation has started. If they don't drink, I'm not interested. If they are into craft beer, I can talk their ear off.
6. Don't be too quick to ask for their number but take it away from the app as quickly as possible. Sounds oxymoronic but power through the getting to know you questions then go for the number. Here is the line I use for that...
"So on a scale of 000-000-0000 to 999-999-9999, if I were to ask you on a date, how likely are you to agree?"
In short, be honest, playful, and make them laugh. If your personality translates over from text to in person, you'll be fine.