jaerose,
He means that you will check in to API and start mustering in A pool and once a week they will anounce who is starting IFS, API, and BOLTC on the following week. You must have completed BOLTC and IFS to class up for API if you are a pilot. As far as your physical that will be done either at OCS if you go through OCS or you will have to get it done when you check into API before you can do anything else that is required to be completed before classing up. Don't worry about this stuf too much though be cause you will get briefed on this stuff at OCS and again after Reporting to API.
Dan