Paydapigg2 you are in for the beginning of a great adventure! Whatever quilt yu decide to start on and whatever size make it something you love and you'll finish it in style. Remember this is not a race so enjoy the process.
There are many ways to make a quilt. No one way is correct.
Leaders, enders, spiders are all the same idea: a double thickness of material at the beginning of your sewing and at the end.
A single holed throat plate is best for piecing or straight sewing. Fabric doesn't inadvertently bunch up in the throat plate hole this way. Using the leaders, spiders also help with this. The wider holed throat plate is for the fancier stitches.
I personally have a 1/4" foot with a flange for quilting. The flange is a metal edge on the sewing machine foot that makes it easier for me to guide my fabric and maintain a consistent seam allowance. Most of my friends just use a plain 1/4" foot [without the flange.] Use what works for you best.
Only my old 1950's Singer would ever overwind a bobbin. Give your bobbin winder a try and see. Overwinding may not be a problem with your machine. If the tread goes beyond the edges of the bobbin then the bobbin is overwound.
Look forward to hearing of your progress. PM's are always welcome.
ali