Welcome to the QB. We've all done our share of 'screwing up', but that's part of learning. Others can instruct you on what and how to do the quilting on your sewing machine. My back/arms/hands don't allow me to do that, so I am clueless about it.
Don't give up. Like I said, we've all screwed up with quilting. Learn from it, and continue on your quilting journey.