Like the idea, see a few hurdles for you to watch out for

1) don't store perishables on ' company ' site - you can get alot of flack for ' sellinng ' limpy carrots
2) dry goods ( cans especially ) also need attention - I was in a derivitive of Amway and there was alot of flack on a dented can
3) cities that you can get at least 3 delivery people in to do the deliveries - people tend to sleep, eat, etc and not run 24/7
4) connections with wholesalers - cheaper you can get before it hits a ' store shelve ' not only more profit, more likely to be fresh

There were more items in the ' off the top of my head ' list, cut it down to the top 4 so you wouldn't think I was against you, instead trying to encourage you with what to overcome ( and you can ).  Good luck with it.