Welcome to the board!
You will find some great advice and wonderful people here!
Ask your questions...you will get alot of answers.
Normally you do your quilt top, with borders then "sandwich" the quilt with top-batting-backing.
You baste or pin these layers together, securely...then quilt as desired.
Then square is all up, evening up all edges then do the binding...stitching it to the top layer to flip over to the backing and finished by hand.
This is how I do it but I am sure others will chime in with their methods and helpful hints.
Kirsten