before laying out $6k on a stall, just spend $30 on poultry and ingredients(condiments, herbs, spices, marinates) to make 10 varieties of flavours and then get neighbours, co workers, friends, family, random locals to rate it. work on building up a desired recipe, menu before purchasing a stall
even do a random survey of locals to ask what type of chicken they prefer, not just when eating out, but more when they home cook because there is not a eat-out option that meets their tastebuds(find the missing niche)
once you have the perfect recipe. choose the presentation.. Caesar salad, chicken cheese steak, chicken burger...
then if you want to save the $6k upfront try the option i mentioned in previous post (replace hotdogs with your prepared/marinated chicken)