Also, if possible try to position a chair or two to support the weight of the quilt as it goes out the back side of the preser foot. the weight hanging off the machine, and/or table will pull ate the quilt, and make it difficult to sew. The chairs or a table will help support the quilt. If you are unsure if you can sew a striaight line, I can't, the you could use blue painters tape or regular ole masking tape if you want to have good straight lines. Just position the tape and sew to one side of it. I have used that techinque lots and its a lot better than trying to mark a quilting line. If you have access to a sewing notions store, check out the varigated or multicolored thread. That will add some pazzaz to the look.
Let us see how it comes out!