For price you have to charge enough to, at the very least, cover all your costs so you are not losing money and you probably want to make something above just your costs.

So what you do is for the first 3 years is keep every reciept that has ANYTHING to do with your farming effort and each year you add up all the costs and that is the minimum of what you have to make a year.

With a CSA all you do is figure out how many members you have and divide what you must make to cover costs and make some money and that is your share cost.

Of course the sad catch 22 is the first several years you really don't know your costs.

On how much to plant there are catalogues such as the Johnny's selected seed commercial catalogue that has estimates of what you should produce per linear foot on many crops but what you will find out is this is just an estimate that is severely affected by weather, location, etc.

I would suggest you start very small and don't promise much as it takes years to learn your land and to figure out how to grow professionally (i.e growing for others) and especially in CSA if you mess up and cannot deliver as promised you will lose most of your members.

Anoither thing many people do not realise is just because you grew it the masses will not flock to your door to buy your food. To get a good customer base takes a lot of marketing and marketing is every bit as important as growing.