I got my HSMP on Sep 2007 and EC approved in Nov, landed UK in Jan 2008, Luckily i have got an offer and started working, i will be receiving first pay cheque this month end

Now i need to apply Dependent Visa for my wife and 2 kids, this tier1 and hsmp rules make confused.
Please can any one tell me how much EC fee i need to pay for each dependent and what other documents i need to submit.
Thank you in advance.