Firstly, I gotta warn you. Within the Clan, if your Childe does something wrong, it can be sorted out without much recrimination (most of the time). But out in the Camarilla, they ain't as forgiving. If your Childe steps outta line, your gonna get beaten back into shape as well, not just he / she / it. You've been warned. Forget it, an no ones gonna come to your rescue.
So watch out who you sire. Bad apples are not cool.
Firstly, I assume you've picked someone you wanna sire. You've seen them, and you wanna give them the Embrace. May be you "love" them, maybe you hate them, maybe your just bored. Whatever your reason, make sure it's DAMN good. When you embrace, it's not just for life, its FOREVER. Not 2 or 3 years, not 20 or 30 years, not 100 years. FOREVER. No going back, no second chances. So be careful. Pick wrongly and it's gonna be around for a LONG time.
DONT sire out of love. Yeah, it may seem like a good idea at the time. "Turn my girlfriend into a Vampire, we can be forever together!" Excuse me, but thats Bullshit. How long have you kept a girlfriend whn you were a mortal? 2, 3 years, got married? But what happens when 2 centuries go by? Will he / she still love you then? Don't think so. Will he / she resent you for damning them to a lifetime of drinking the blood of mortals? Probably. You ever tried to fight someone you were once in love with? Not nice.
My advice, and Caine's (if you trust the Book Of Nod) - Don't sire out of love. It'll turn out worse than you could ever imagine......
So, now you've got someone you trust, someone you think wants to become a Gangrel. Make sure.
Watch from the distance. Follow them, watch as they move in the night. Hunt them. Make sure you know their movements, know that you can trust them, know that they are right for the "gift". Sometime in your existence, you'll be asked to recount what happened, and if it's good, y'know, exciting, interesting, it'll earn you untold respect in the Clan.Trust me, a story of a good hunt'll get you respect, and possibly a place to crash during the day.
The hunt could be just that, track them, corner them, embrace them. Or maybe its just embracing them after a long period of a ghoul. Whatever happens, make sure it's good. After all, you only get one attempt. And it's something they and you will never forget.
Leave them some easy blood, yours or anothers for when they wake up, and make sure they ain't gonna wake up in the sun. Then leave them be. Walk away.
Stand back, and hunt them once again. Watch them.
It's considered bad form to intefere with them directly, but try and keep them out of trouble. Step in when the breach the Masquerade, keep them from falling into the hands of the Sabbat, and keep them from makin' fools of themselves. But don't let 'em see ya. It just isn't fun.
When you think they've gotten a good idea of what they are, then you reveal yourself. Tell 'em who you are, what they are and hope for the best. Teach them about the Clan, the Camarilla, the Sabbat, and who they can trust. Then from there it's up to you. Some stick with the kids, others let the wandering instinct take over. Whatever you do, make sure they stay on the rails. After all, it's you who's gonna account for them in the Camarilla.
Be Careful, Choose Well, And Watch Their Back, And You Can't Go Wrong.