[j-nsp] Service Set Help !!

[Ovais Iqbal]

Dear Sir, 
  I am new to juniper and currently we are shifting from Cisco to Juniper J series router, i have gone through Jnics student guide but i am not able to understand service set and its associated issues like interface-style, next-hop style, i have also seen the example of Life of a packet but still i have confusion, its just like i am not satisfied, we are using VPN and Qos in our environment, so is there any books or resources that any of you can share with me which gives a detailed explanation of how service sets actually work ?? 
   
  i have tried software documentation but it didnt help much so kindly guide me in this
   
  Thanks

       
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