There are a number of resources that will provide advice on what you should or should not do on a date. Simply look to google and lists come out of the yin-yang about not passing gas to not chewing with your mouth open to bathing. I suppose I shouldn't assume the seemingly obvious nature of these lists considering some of the horror stories I've heard. But what I find interesting about these lists (and I'm guilty of it too) is that while they generally rehash advice on well established Do's and Don'ts (i.e. manners, sensitive topics to avoid, etc.) they do so without touching on 3 key behaviours, which should always be avoided in any dating situation: judgment, ridicule, and pressure. These behaviours tend to manifest themselves in various forms, and are the precursors to trouble.
One of the advantages of being single is the freedom to make major, life-changing decisions without consultation, much less regard for someone else's future or well-being. Because If quitting your job and moving to another city is really only going to affect your life, the choice becomes that much easier. Even less ground-shaking possibilities, like the opportunity for a last minute vacation, are so much simpler to take advantage of if you are unattached.