Your top should be pressed, loose threads clipped/removed, if there are a lot of seams along the outer edges it is a good idea to stitch a running stitch all the way around the outer edge of the quilt, about 1/8" in- this keeps those seams from pulling apart as the quilt is advanced on the rollers. If the quilt is directional it is good to mark the top, indicating the top (backing too) each piece, top, batting, backing is loaded individually so they need to be separate pieces, neatly folded. The backing and batting needs to be larger than the top to accommodate being loaded and clamped ( each quilter has their own preference on how much bigger- I usually ask for an extra 4"-5" all the way around, so if the top is 70" X 80" the batting, backing should be about 80" X 90")