Develop a small ERP software

hai..i am software engineering student.anyone can help me in designing a small ERP software

1. which area and feature is most important for ERP software?

2. what technology is require to develop an ERP software?

3. To develop a ERP, it is need to include customization feature. if yes, it is i need to develop a compiler also for the ERP?

4. other than develop a compiler, do we have another way to do customization for ERP?

5. where can i get the resource to develop an ERP software
Thank you!~~