The company that was awarded the contract should have provided the implementation schedule for you at the time of the bid. If not, then I strongly suggest you ask for one prior to starting the work. This will give you something to measure. You can try to come up with your own, but you will need to know the hours they will work on each part of the project, the number of resources, and what is required for testing and final approval (some of this information will come from you). It is in your best interest to have a project kick off meeting first. Develop the schedules, testing and approval procedures, and then begin. The best projects start with a good plan.