After buying a sourdough loaf at a local mini-food festival, I thought I really needed to have a go at this so I did a quick search on youtube & a chef on there suggested that starting your own sourdough starter was actually pretty easy. 1 tablespoon of flour & the same of water in a pot. 8 hours later add the same again. 8 hours later add a 1/4 cup of each again - but this time you should see it bubbling & doing sourdough goodness. Sounded too easy so I was sceptical - but then the waste was less than half a cup of flour which was not going to break the bank

I followed this guys approach to creating a starter & it worked a treat - a week & a bit later we have a very active starter which doubles itself in size after feeding within a few hours & it has gone through the day 2-ish smelly stage & come out the other side smelly all yeasty & lovely. So rather than just cultivating it (binning half every 12 hours & adding back in equal quantities of flour & water), I am doubling the size of it ready to take some out to cook with.
I'll update this post after I cook our first sourdough loaf on the Kamado this week - but wanted to give people a heads-up to this persons site as it is pretty comprehensive on how to get started with bread & sourdough.
Enjoy!