Hijab is a topic people shy away from and don't want to talk about, out of fear of being unpopular. The only topic more controversial to talk about to women than Hijab is polygamy, but that is for another article.
Anyway, here are a few short pointers on Hijab:
1) Hijab is compulsory for both men and women in front of members of the opposite gender whom they can marry. (that includes your cousins)
2) Area of Hijab for women, minimum is to cover everything except their face and hands. (yes, some scholars say face as well, but I'm talking minimum, agreed upon, etc)
3) Area of Hijab for men is whatever is between their navel and their knees (not including navel or knees), men are also prohibited from wearing pure silk, jewelry (except a ring) and shaving their beards
4) Both men and women must lower their gaze if they feel desire when they see a member of the opposite sex.
5) Both men and women must NOT wear tight-fitting or transparent clothing
6) Both men and women must NOT wear sexually attractive clothing or talk, act in a sexy manner
7) That is between people you can marry. In front of your brothers, father, other women, etc, a woman only has to cover from her bosom to her knees
8) Between husband and wife, all the above rules do not apply, its No-Holds-barred!..except two but thats a different topic.
9) The above rules apply on Facebook as well, in your profile and album pics
10) Many women find wearing Hijab difficult, try your best, do it for Allah and don't worry about what people say.
11) Your hijab is NOT hijab if: 1) You backbite people who don't wear it
2) You beautify your face and Hijab enough to turn men's heads
3) You are a muscled up guy wearing a tight fitting shirt
4) Your hair, neck or bra straps are showing!
5) You flirt around despite wearing hijab
12) Lowering your gaze is difficult, let us make it easy for each other by dressing appropriately.
13) If you fulfill the above conditions and the opposite sex still gazes at you with lust, you have done your duty, they must learn to do theirs, which is lower their gaze (I know men who look at Niqabis' eyes and how beautiful they are)