The nice thing about androgyny, especially if you're young, is that there are great-looking youth styles to try. The whole Goth/Emo thing springs most readily to mind.
Since androgyny borrows from both sexes, its probably a good idea to have a look at some images from the fashion world, and the world of popular culture to get some ideas.
I'm finding androgyny fascinating but quite a difficult thing to do well; i am TV so quite used to femm-ing up, but to shade male elements back in is tricky.
To feminise, clothes have to be far more fitted; to be male, looser. A little eyeliner for males if required etc. Its all about degree - a little here, a little there...
As for what you tell your family - this always comes up for transgenders, and the impetus seems to be the extremity of the change - why not change a little at a time, and get them used to seeing you with the odd bangle, piratical earrings (a la Johnny Depp) and get them used to - not much at a time, Be yourself and get others to join in the fun - slowly!!
Clare xx