There are several things that you will need to consider, are you planning on using the same process? If so, you will need to disable some features within Project Server related to reporting process and enable others for use with the resource pool that comes with Project Server. You will also need to setup the resources in each project file so that match with the resources in the Project Server resource pool.
If not, then you should understand what the new process that is part of Project Server and how that will impact the current things that you do. Project Server comes with timesheet reporting for task reporting progress by team members. This moves the function from the Project Manager to the resource by default. This is just a few of the things to consider.