From experience?
What are the signs a man is actually going to be worth your time?
Do you think a decent man should want to go out for dinner? I am in two minds about this. If it's a distaster you don't want to be stuck for hours. OTOH I think if someone suggests dinner it shows that they are more willing to make an effort to spend time talking, not getting drunk and increasing their chances of getting laid!
I would say avoid men with shirtless photos. I had one guy message me that he had been sleeping with his best friend's girlfriend while the friend was on holiday - how to make a good impression!