Hi Shiva!
Are you planning to work with a legacy system such as SAP or Peoplesoft, or will you be working on the design aspect of a Training Database System? If it's a generic project, you may wish to start with the Data Flow Model. First, make sure you have the Algorithm of Data, the Entry points, and the Data Interrelationships. To simplify, I am providing certain questions; just try to answer them, and you may end up with a workable model.
1. What information is required? How do you translate them into the form of a Database? How many interrelationships are there?
2. What will be the end product? Will it be a stand-alone warehouse or something that will keep changing? What relational changes are needed if it's a relational database?
Just my viewpoints. I think if you tell us something more regarding the project, the group will try to be of help.
Regards,
Thesysthink