So... getting the bad stuff out of the way.
I do not want kids. So if you have kids, don't message me.
I don't like dogs. So if you have dogs, don't message me.
I don't drink, smoke swear or lie. So if you do any of those, don't message me.
If you have a tattoo or retarded piercing (lip, nose,etc). Don't message me.
I prefer the blunt approach. None of that stupid pretending to be someone you're not or 'bending' your rules or requirement to appear more attractive to a potential mate.
That's stupid. Why would you not just be open and honest right from the start?