One of the easiest patterns I know of, that is perfect for beginners, is the Oliver +S Lazy Days skirt.
It’s a free pattern with no seam finishing – which is my least favourite sewing task.

I don’t have many construction photos of this skirt because I made this years ago. This is actually the third kid to wear this skirt. Yay, for hand-me-downs!

Summary
Pattern: Lazy Days Skirt by Oliver + S.
Fabric: Quilting cotton.
Size: One size.
Cost: Pattern: $0 Fabric: About $10.
Sewing Level: Beginner.
Modifications: none.
Results: Great. Makes a fast, easy skirt.