A.M.
I have sold a fair bit on Craigslist - it has mostly been kids stuff (toys/cribs etc), so usually it is parents/grandparents contacting you. Talking over the phone usually gives a fairly decent idea about the person. I have had people come to my house - many times I will have the stuff in my garage and when they come to pick it up, I just go outside and they don't have to come in (the only exception was the crib). Sometimes, I have met people in a parking lot (like Jewel).
To determine prices, I go on Craigslist or ebay and do a search for similar items or the exact item I am selling. Then depending on the condition of my item in comparison to the others and how old it is, I will decide on a price.
Good luck.