If you kiss on the first date and it's not right, then there will be no second date. Sometimes it's better to hold out and not kiss for a long time. I am a strong believer in kissing being very intimate, and the minute you kiss, the floodgates open for everything else.
Someone able to carry on a conversation whether the topic is silly or serious. Knowing enough about life so that you always have something to say is a definite bonus.
You can never control who you fall in love with, even when you're in the most sad, confused time of your life. You don't fall in love with people because they're fun. It just happens.