You pay for dinner, since the man is doing you a favor by being seen in public with you. You also leave the waiter a 30% tip and give him an enthusiastic blowjob, no matter how good or bad the service was. After all, any man doing anything for you is reason enough for you to suck his cock.
Make sure to swallow. If your date is still around after your done, offer to let him fuck you right over the table.