Airlines ticket consolidator website

Hi, I want to build website where our customer (Travel Agent) will able to login and make booking for flight,car hire,hotel etc. Must be option for create new a/c for each new travel agent. Booking will generate using Ypsilon Internet Booking Engine (we will get link from Ypsilon and then need to build from that link I-frame for home page for each travel agent if they required) Ypsilon will connected to GDS [login to view URL] website will allowed travel agent to take mark up from client credit card - API integration will provided. We will provided each travel agent to separately link for booking of car hire, flight, hotel, transfer, ferry, insurance etc. Level of access to product must be set for each user (travel agent). List of available carrier must be provided with two letter IATA code, we will deliver contact number for each airlines. Website must look very clear