A few popular YouTube channels that provide how-to videos on rag quilt projects are Missouri Star Quilt Company, Beverlyfabrics, and Fons & Porter. Missouri Star Quilt is the most popular channel on YouTube for quilt-making, as of July 2015, and has over 262,000 subscribers.
A YouTube search returns 16,500 results for the query "rag quilt tutorial." The most popular YouTube channel today is Missouri Star Quilt Company, which was established on February 28, 2009 and has over 56 million views to date. The attached link provides a four-video how-to series for creating a rag quilt for babies. The video series is highly popular, with over 1 million views and a 96 percent "like" rating. Missouri Star Quilt Company's website offers all supplies and accessories needed for quilt-making, including fabric, patterns, hardware and kits.
Beverlyfabrics and Fons & Porter are also highly popular channels that offer instructions on rag quilt making, with over 2 million and 6.4 million total views, respectively.
Other resources also exist online for instructions on how to make rag quilts. Quilting101.com provides an overview of all the steps required to cut out and construct a quilt. It also offers fabrics, tools and kits. About.com describes fabric selection and seam dimensioning in addition to the cut-out and assembly steps.