Start with sewing together a sandwich with a warm cotton center so it will be warm. You might know someone who quilts and will sell/give you enough from their roll of cotton batting. Don't use synthetic batting. The ones I made have either 1/2 cotton, or the two that I used damaged wool blankets, where I stitched up and repaired the holes before I started. They are all VERY warm bc the batting and the bottom fabric are all cotton or wool, even though the tops are the synthetic fleece.
It's easier to follow a pattern to stitch that is already on the fabric. If you go to quilting sites they will have you buying specialty plastic rulers, where you make squares then cut them to perfect with a rotary cutter. You will spend ALL of your seed money on this!!

I used fleece for the top fabric. I had bought 6 full yards of fleece that looked like candy striped Hudson Bay pattern. I had 3 "youth" blankets gathering dust and decided to make all 3 into quilts. I used thread to match the stripes, green, red and yellow. I had trouble with my regular machine bc they were each 3' x6' and the quilt would bunch next to the machine.
REMEMBER: quilts were normally HAND SEWN, and hand and machine sewing is always acceptable.
I am a thread nazi, so buy new thread for every project.
The idea of quilting is to keep a warm batting between 2 pieces of fabric from bunching. SOMEHOW, quilting has beCOME creating complicated patterns in various sizes of squares the run N-S, E-W.
It is a VERY EXPENSIVE hobby.
The nice thing about your machine is that you can use fancy stitches on your machine, and save the straight hand stitching for the troublesome parts.
Best to plan a month or two on a quilting project. Keep your machine and supplies away from your cats!!!!
You start, you stop, you pick it up again, etc.
DD's have a craft room and they sew to movies on their oldest flatscreen. They do NOT allow cats in that bedroom.
Otherwise, have fun!!
One good place to find fabric is at estate sales. Many women pick up fabric with no specific use and family finds it is drawers and bins and they don't want it.