I'm not sure what the rest of your practise is. Ajahn Brahm covers it in Mindfulness, Bliss and Beyond from an Ajahn Chah sort of approach.
There's plenty about walking using the Mahasi approach on the following sites, but if you don't use that approach is might seem overly complex. http://aimwell.org/http://www.buddhanet.net/insight.htm
This is a quick introduction: http://www.buddhanet.net/imol/vipcours.htm
That's my main practise. I do equal periods of walking and sitting, walking first.