Sorry to be so late to respond but I have been out of the loop for a bit.
My year went pretty good. I did not know what to expect as a first timer.
My intention was to sell only at the local farmers market but I sold just as much by word of mouth from the house.
I used both commercial pots and plastic/foam drink cups and I dont think it mattered. I think most folks pick and choose based on what the plants look like and not what container it is in.
I thought folks were more willing to try "heirlooms" than I thought they would be.
Peppers are really popular. I will have more next time, especially hot ones.
I am also thinking about a small pvc hoop house. Nothing elaborate. In fact I am seriously thinking about putting it over the garden spot and taking it down at planting time. I am just looking to protect the seedlings from the elements during spring.
I buy my supplies from 2 places.
1) We have a nursery supply close that anyone can buy from. Best price around for potting mix, vermiculite, etc. And you can just buy single bags. Pots, trays and such are by the box or case and still a good price.
But if I want less I use these guys.
http://www.greenhousemegastore.com/ I cant say they are the cheapest but I thought they were ok.