Also, conventional wisdom is to start out at the farmer's market. That way you interact with locals who buy local food, see which niches are filled and which aren't. It also makes people interested in your produce, and gives them a chance to try it with low risk--when you're an unknown entity, few people are gonna want to spend hundreds of dollars and link themselves to your produce for a whole season. Spending $2 and getting some tomatoes/bacon to see if it's any good is a lot less intimidating for a lot of people.
The market is your better option if you end up doing livestock, which are very seasonal in production. You can't slaughter pigs til fall, so you don't have any pork to give away until fall. A CSA based on one or two months isn't likely to prosper.
If you do decide to try this, I'd highly recommend buying a book called The Lean Farm, and if you do veggies, try The New Organic Grower by Eliot Coleman. Additionally, if you're in the States, look up Cooperative Extension. Lots of resources for farmers there.