please give me suggestions

[sifatm...@upesh.edu.pk]

1. i want to simulate a wireless sensor network having different wireless nodes which will be connected to each other on the basis of some condition.
   
2. i want to calculate the distance between nodes and from sink node.
3. i want to calculate number of packets sent from source to sink 
4. i want to add an adversary which will move to immediate sender of the packet which it senses some transmission.

so please all of you are requested to suggest me that which framework should i use for doing these tasks as i am new to omnet++. your suggestions will be appreciated.

Thanks to all in Advance

Sifat