Double Knitting, Casting on with Both Yarns, Or Only One. Plus binds off's for these two approaches.
Creativebug online class: The last part of any knitting project is called finishing, when all your hard work comes together into one magnificent creation! Debbie covers some of the most common finishing techniques – including seaming pieces together, the Kitchener stitch, working away yarn ends, blocking and much more.
Stocking stitch tubular cast-on by Ysolda | http://ysolda.com/support/pictorial-guides/double-rib-tubular-cast-on/