How can you be an effective Team Leader?

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It's been a year since I got promoted to a Team Leader in a CallCenter I worked for... I've had a total of 6 sets of teams that i handled, each of which consists of 12-15 agents... I was really excited when I started and quite frankly I did well, because i have developed agents who performed very well... That was then... lately, i've been assigned newbies; fresh graduates with no work experience at all... i found it harder because i'm not only tasked to make them perform, but also ramp them from ground zero! i'm finding it harder to get through them... I have developed, say 20% of them, but most of them are having a terrible time coping up.. some even got terminated because they didn't perform.. at first, i thought, it was just the way it is... they are not qualified enough, hence their dismissal... but lately, as the number of departures/attritions increase, i'm beginning to wonder... could it be that i'm not doing my job well enough to ramp them up to perform? was i an effective team lead or coach? how can i be an effective team leader? :(