You only need a few Basic Cookie Decorating Supplies to start decorating cookies. I have complied a list of things you need to start decorating like a pro.
Basic Cookie Decorating Supplies and a Printable Shopping List
A list of some of my most commonly used cookie decorating supplies
Crash Course in Decorating Cookies. "Jennifer from Not Your Momma’s Cookies talks about decorating sugar cookies--the basics, equipment needed, and a link to easy and beautiful tutorials."
A Beginner's Guide to Cookie Decorating Supplies by Semi Sweet Designs @SemiSweetMike. A comprehensive list of all the tools needed to create custom decorated cookies.
Basic cookie decorating supplies and a printable shopping list.
loving the simple look of stamped message cookies and just a touch of icing...
Bubbles and stars in a Champagne glass by BAKRGAL aka Barb, posted on Cookie Connection
How to stencil-paint a cookie | Mistletoe Cookie Tutorial | by Robin Martin for TheCakeBlog.com