Ahh, CSAs--A subject near and dear to my own heart!

And MTN, thanks for the kind words. Before I say anything else, I feel like I should preface my comments with the fact that so far my CSA has been making less than $8000/year. I have 8- and 11-yo kids, so I have chosen to keep it very small and do farmer's markets as it suits me.
This year, I am expanding to 20 families, planning to attend 1-2 farm markets every single week from May-Oct and see how close I can come to replacing my current day job with this one in 1-2 years.
If you have the ability to start small, I think that's a great idea. I started with 4-5 families. I already knew I could grow vegetables nonstop from May-Nov because I had been doing it for about 10 years already. I also knew I could grow far more than our family needed, because I had been giving food away for years. So, I had some confidence. Then, I started offering "shares" to people and learned as I went. I'm still learning all the time.
Around here (your soil/climate may vary), CSA farms sell about 40 "shares" for each acre they run. We just finally walked our land off, and it looks like I have about 3/4 acre for 20 shares, but we also have a fair amount of perennial fruits/asparagus taking up land.
Around here, the standard share is about 20 weeks long with 6-12 items per week. I aim for mainly typical vegetables with great variety within that grouping. For example potatoes, but purple, red and fingerling potatoes. And I also put in plenty of things people cannot find anywhere else--like kale, chard, purple kohlrabi, radish pods, etc.
So, growing is one thing, but you also need to be able to market it. Find customers, keep them happy and get them coming back the next year. You need to be an excellent record keeper (to learn, and to be certified organic, which I am doing this year). You should be a great communicator and people person (especially if having on-farm events, going to farmer's markets or doing talks to draw in new customers). It helps to have endless energy (I train for a 10K every spring to get in shape for the growing season

) It helps to be able to handle stress, as you're at the mercy of the weather, and people have already paid you! Plus, you swear there is no way you'll be able to do it, but it always works out.
So, I'm rambling and this is not helpful. Is there something specific you want? Otherwise, I'll try to break it down better.
Growing--weed control, pest control, greenhouse (or basement) early plant starting, knowledge of prime time for picking things (especially unusual ones you haven't eaten before)
Marketing--finding customers, keeping them happy, weekly newsletters, on-farm events
Business--tracking expenses and income, knowing how to make a profit, long-term and short-term planning, crop planning, share planning
This year, I plotted out on Excel every single week I plan to have shares from May through Dec, 30 weeks total. Every week, I have planned out what I intend to offer. Then, I worked backwards to figure out when that crop would need to be planted outside, transplanted, or started inside. I aim for 1 green every week, 1-2 herbs, 1 onion product, 1 garlic product (green garlic, garlic scapes, fresh or cured garlic), plus multiple vegetables.
You also need to decide pricing and variety of share options. Here's what I have:
Spring (4 weeks)
Fall (4 weeks)
Winter (2 huge deliveries)
Regular (20 weeks)
Large family (double, but still 20 weeks)
Every other week (20-week season, every other week)
Local fruit (mainly berries and rhubarb, some local apples/pears)
They range in price from $130 to $525. I also belong to MACSAC (see
www.macsac.org), so my customers have access to $200 health insurance rebates plus possible cost sharing if they have a low income. This is hugely helpful to them, obviously.
Sorry to go on and on, but I'm not sure what would be helpful. If you have specific questions, I would be glad to help! Here is an excellent book about the business side of CSA farming and I highly recommend it! The Organic Farmer's Business Handbook: A Complete Guide to Managing Finances, Crops and Staff, and Making a Profit, by Richard Wiswall.