Before u going to start ur proj, u have to get some basic details and requirements from d company. The details u should collect are:
1. Get filled specimen of all appln forms and receipts. it ll help u in declaring fields for classes
2. Try to get info of all of firms processes and calculations from companies near u. Keep note of everything for future references. It ll help u in defining methods for classes.
3. Clearly understand &/ ask wht they expect in your project.
These all very basic things. do u need which type of data? 1. how operations are carried on in financial firm and so (or) 2. how to segregate proj into modules and so.