If you meet for lunch, you always have work obligations as an excuse if the date is a bust. And if you're having fun, you can always agree to meet again. You're checking each other out, but you don't need to work at it to impress him. If the date goes well, you will no doubt find yourself thinking about a second date. Don't worry if he doesn't call the very next day.
Men like to sit back and evaluate how they feel.
They also know that waiting to call you sends a message that they have a life outside of dating or that they're seeing other women. Either way, it shows that he's not desperate. On your second date, go out for dinner. Give yourself more time to gather information about your date. Don't go to a movie where you spend two hours sitting silently in the dark.