There are some things that you will almost get conflicting advice/suggestions for and/or multiple ways for "how to do"
Some of the topics are:
to wash or not wash fabrics before cutting them
to use or not use starch/sizing
how to make half square triangles
what kind batting to use
the list goes on
If you can sign up for a "beginner" quilting class, that might be helpful. I think one of the big hurdles for someone that has been sewing clothing (using woven fabrics) is going from a 5/8 inch seam allowance to using 1/4 inch seams allowances - even though we've been trimming down inside collars, etc.
You might also consider asking for suggestions for a a "how to quilt" reference book. There are many out there - maybe check at your library to see which one(s) you like better. I consider myself to be an "advanced beginner" - and some of the books are easier to follow than others.