Welcome to the Board from Minnesota, USA. There are many sources on line to get basic information, and there are many, many people on the Board who can help you if you run into a problem. Since you already know how to sew, you are in a good position to learn to quilt. Probably the most important difference between regular or garment sewing and quilting is the 1/4 inch seam allowance (or 5 or 6 mm, I'm not sure what it is in metric.) We're glad to have you here!
Leslie