when double knitting, the knitting is complimentary (so A becomes [COLOR=Red]A[COLOR=Black]) [/COLOR][/COLOR][COLOR=Red][COLOR=Black]which works fine for A (since is is a reversible letter
but with double knitting an R becomes a backwards R on the other side..
and even if you knit words
not all letters work in reverse!
you might be better off working in round.. in intarsia or fair isle.
(meanwhile this page on my blog has links to my 8 part series of double knit info) --with a link to a YouTube video with 1 style of cast on (there are many cast ons suitable for double knitting) and some stitch patterns and some ideas for patterns.)