How to deal with SAP E Sourcing

Hi Experts,

I am very new to SAP E Sourcing and I am a java developer.I need few things to start customization in the code bean shell scripting.

1) Where we will resolve the issues in E sourcing (like debugging and testing in which tool) ??

2) How does the will work in the sourcing ??

3) For which purpose we use TOGETHER WORKFLOW EDITOR (TWE) ??

If possible please provide me one example ASAP.

Regards,

Kanthu.