Repayment Scheme Module

In overall terms I need to have a Repayment Scheme Module developed. The project is split in three phases. The first phase is basically the phase where the basic competencies are verified. That means I deliver a dev environment (simply a Visual Studio project). The first task simply is to extract three datafields from the webservice an present them on a web site. The very first task is to get familiar with the dev environment, and have data extracted from the system core. The next phase consists of the actual calculation of the complete repayment scheme including interests. The complete scheme must be presented to the user. An interest calculation module is available in the dev environment. The expected payments must be created on the case in the core system. Interests are not created. Furthermore the core system must be updated with activities and mailing info. Existing repayment schemes must be made editable. The final delivery is to be submitted as user control. The third and last phase includes making documents on the repayment agreement, and other documents by using iTextSharp. That part is NOT to be included in this specific project.