I have absolutely no advice about running a CSA, but perhaps I can offer a consumer's perspective since we belonged to a CSA in 2003.
Here's the website of the CSA I belonged to:
http://www.elysianfarm.com/main.shtml
It was well-run and the variety was good. My year wasn't the greatest in terms of production . . . lots of rain and bugs. I probably would have done it again (because I really, really like the idea of supporting local farms), but we found it just too pricey for a full share, and the half share wouldn't even make a dent.
My favorite thing was her newsletter. It was great to hear about what was going on with the farm, how various crops were doing, what was going to show up in our boxes next, and a few recipe ideas for some of the more exotic offerings. (Fennel is quite tasty, by the way.)
I liked how I could pick up my alotment in town. She had a few distribution points throughout the area, and if you volunteered your home as a place where people could stop by and pick up their alotment (sitting in a box on your front porch with their name on the box), then you'd get a reduction in the cost of your share. I'd stop by, drop off my old waxed box and pick up my full box.
I liked the variety of vegetables. It's easy enough to find fresh greenbeans, but harder to find interesting varieties of tomatoes, fennel, various types of greens, unusual radishes, etc.
For the most part, I found the portions generous. There were, of course, months where the pickings were pretty slim, but she always made an effort to beef up the alotments the next go-around. You always felt like you were getting value--in her newsletter, she would detail what a full share got and what a half share got that week, along with the estimated weight and market price. Of course, market price didn't mean that much to us since we paid a set amount, but in the end, it was nice to see that we still got more value (per market prices) than we paid in (or at least that value).
It was never really discussed to what extent she would sell "extras" at the farmer's market, but we all understood it. I emailed her once asking if she could throw in some extra tomatoes and let me know the cost, and I'd drop off the cash and leave it with my old box. She promptly emailed back and said that it was absolutely no problem--she'd love to give me some extras for free. (They were delicious.) I did notice that when she had a bumper crop of something, she was very generous with our alotments.
We got no choice in what we received, which was both good and bad. Good because I tried stuff I probably wouldn't have, but bad because I got some stuff I really, really didn't like.
That year, she had rented a portion of a blueberry field, and we were welcome to go to that field and pick blueberries for free. That was a nice plus.
What I would suggest is not giving the customers a whole lot of choice--it's a lot of extra work for the grower, and most customers will be okay with having the grower select for them. When a special request comes in and if it's easy to accommodate, then you can graciously do so.
I would also suggest a newsletter--that really made folks feel like they were a part of the whole process. For most people who belong to a CSA, we could get what we want at the local farmer's market and not have any risk at all. In fact, we'd probably be able to get what we want cheaper through a farmer's market. For most of us, joining a CSA is a way of supporting an agricultural lifestyle and business, recognizing that we're helping to share in the bounty as well as the risk, taking a burden off of the farmer . . . no matter what, they'll get paid, even if it's not a great year. That being so, I think it's important to make them feel as if they are a big part of what is going on, even if they never put a foot on the farm.
I also am not sure how to set the rules. I want any excess to be used as for sale from the farm to others or at farmers markets and any other excess donated. I just dont know how to make it clear that they will receive a certain amount if production is high and not ALL that is there and yet if things dont produce well that they wont receive very much if any.
Evilbunny--most folks understand that not all that is produced will go to the CSA members. However, it is likewise understood that when there is a bounty, the CSA members share in that . . . maybe not all of it, but certainly a decent portion of it. Otherwise, for the CSA members all the risk is on their part--bad year, they get very little; good year, they get just about what they paid for.
As a consumer, I would find any of these acceptable:
1) Plant a CSA plot and plant your other stuff (farmers market, charity, etc.) separate. All of the CSA plot goes to the CSA membership.
2) Tell people upfront what you expect the harvest to be on an average year, and tell them that if there is excess, CSA members will share in 20% of that excess, with the rest of the excess going to charity, farmers market, etc.
3) Keep it loosey-goosey, but be very careful to share any bounty with the CSA members and to let them know what's going on during the course of the growing season. (For example, "Looks like we're going to have a sad strawberry season--with all the water . . . but it looks like we're going to have a bumper crop of blueberries . . . .")
The bottom line from the consumer's perspective is that while they want to support the idea of a CSA, they also want to get some tangible value out of their investment. To the extent you let people know what's going on at the farm, I think you'll find them pretty understanding. Of course, that presupposes that the farmer will plant a sufficient amount of crops and take care of them properly.
I'd love to hear more about folks plans . . . it's exciting watching from the sidelines.