i'm just getting started, so i can't really speak long term. what will be my laying flock will be 10 weeks tomorrow and i'm getting heritage meaties in March or April. i'm going to be using the Salatin method (you can read about it in Pastured Poultry Profits by Joel Salatin). my goal is to process around 200 birds (mostly chickens but a couple turkeys too) next year.
as for marketing and selling, i'm lucky to have a big family and lots of family friends who have already signed up to be customers. come February, i'll be asking people to order their first batch of birds. The plan is to order a batch of 100 or so in March/April to be processed in June/July and then order another batch in May/June to be processed in August/September. customers will then be responsible for the # of birds they ordered. if you don't want to be inspected by the government, you have to market them as live birds and process them for free. most people will understand this.
also, look into information about CSAs (community supported agriculture). people pay up front with the understanding that they are sharing the risk with you. they get a % of whatever is raised/grown rather than a particular number of birds. this is a good way to get people personally involved with your project as well as lowering your personal upfront costs. lots of people who buy into CSAs want to come and help out from time to time, which could be a good thing (or not, depending).
i've set up a website (right now it's just a blog) that will hopefully generate more business for the following year. the goal is to have most of the return customers ordering through the website. new customers will still have to call in, because i'm only accepting people who are dedicated enough to wait 3-4 months for their birds to be ready. the last thing you want is to raise a bunch of birds for people who won't ever bother to show up and pay for them. the 2nd year, i'm also planning on ordering a small number of extras to try to sell at the Farmer's Market to generate even more business, but this will be a small % of our activity.
it's a really exciting thing once you jump in with both feet! i'm having a great time figuring out all the logistics and really can't wait till February. it'll finally be real then and not just something i'm talking about. good luck!