model creation in sap bpc 10.0???

hello experts,

  I'm bpc fresher I need to create a sales model with dimensions account,entity,category and time

account includes sales quantity,sales price revenue,cost of goods

Entity->INDIA as parent and banglore and hyderabad as child nodes

category->actual,plan

time->2011,2012,2013,2014

I never tried in real time system  can any one help me.

Thanks in advance

sushma