welcome to the world of quilting your quilt. that said i am an amateur at fmq myself. there are two "quilting" feet that you will need. one is for free motion and the other is for straight line and stitch in the ditch. be sure which one you are getting. eventually you will need both.
beyond that i would recommend you search here on qb for tutorials on fmq. also check youtube and other internet sites. there are a lot of them with video that will be very helpful. brother probably has something on their site as well.
good luck and remember that it takes practice, practice, practice. so, don't become discouraged if you are not perfect right out of the box.
good luck.