I decided to see if anyone in my local Hackerspace group would be interested in getting involved, so with a bit of luck I can get on with more technical aspects and hopefully someone else can do a little administration and marketing.
I found a great book about dividing shares and responsibilities in startups called ‘slicing pie’, so if you own half the company but then do no work your % slowly decreases. The authors Stanford lecture is well worth watching if you’re thinking about making a startup.