I went to a girls school and had much younger brothers so was terribly shy around males. I hated dating and did very little - my husband was a friend first so that made it easier.
I think feeling comfortable with someone is important - where there is an easy and interesting/stimulating exchange of ideas, opinions etc.
Also, I agree someone compatible - similar value and moral standards. I think manners are very important and for me open mindedness - I didn't want someone traditional - I wanted to pursue a career, travel and be independent so wasn't interested in someone looking for a stay at home wife and mother.
I also think its best to take things slowly...it astounds me how quickly people move today - before they really know someone - I think there was something nice about the old fashioned courtship.
A psychologist (at a dinner party) once told me if a woman sleeps with a man very quickly they will have a sexual relationship - if you wait until there is an emotional attachment you can go on to a full relationship (and hopefully, lasting)
I must say some of the stories I hear from my workmates are both funny and sad - one of our PA's went on a date with our accountant - both in their early 30s - he talked about money and sex all night - when the bill arrived they went dutch but he insisted she put in an extra $8.95 to cover the side salad as he hadn't eaten any of it. She didn't quite have the right money and he was owed $1.75 so he stopped at a service station on the way to her home so she could get change and they could settle up....needless to say, there will be no second date. I know both people - he can't understand why she's not interested in seeing him again and wanted my opinion - I didn't know where to start!