OK, ones I'll be telling DS.
Be wary of any woman who uses crying to win an argument.
Be wary of any woman who appears to not be able to afford her lifestyle, designer handbags with a grand of disposable income each month, fine. Designer handbags funded by credit cards, or parents, or boyfriend, not good. Additionally, be wary of any woman with ambitions for a lifestyle who is without the ambitions towards a job that will pay for it. She is looking to someone else to fund it, never, ever good, even if you can afford it. (this is particularly important if your DS looks like he's going to end up successful, you want them to end up with a woman who loves him, not his earning potential)
Be wary of any woman who shows no interest in your work, friends, interests. It's ok not to be into rugby or gaming too, but to show no interest in you do isn't good.
Be wary of any woman who wants to change you dramatically. A lot of woman do seem to want to change a man and it's seen as acceptable for a lot of people - she'll either fail and will be unhappy with who you are, or she'll succeed and you'll be unhappy with who you are, find someone who wants you - not an improved version of you.