Amazon.com: 16 inch US Size 6 /4mm Stainless Steel Circular Knitting Needles Set for Beginners, Round Metal Knitting Needles with Fixed Lace, Circle Needle for Small Knit Projects Socks, Hats, Christmas Stockings
Selecting Knitting Needles - dummies
Knitting needle sizes & Conversion chart [+ recommentation for beginners]
Switch Circular Needle Sizes When Knitting in the Round - PurlsAndPixels
How to use interchangeable circular needles – Elizabeth Smith Knits