I'm on Ebay and have to be honest with you and say I don't know about the zero feedback. Also considering you will have zero feedback, do you not think its a bit much to put that on anyway?
That aside, I prefer to sell with the item ending on Sundays because more people are free. Or if that isn't suitable for you, at least end it in the evenings. If you put something on ending at 3 o clock in the morning you will obviously get less bids. I time mine to finish about 7, 8, 9PM ish sort of thing.
Make sure you include a photo of the item and don't send the item until you get the money, I rather foolishly sent an item as soon as I got the cheque and when it didn't clear I was left out of pocket.
And lastly rather stating the obvious here, most people on Ebay are honest but some will rip you off if given the chance so use your head and think sensibly.If something looks too good to be true it probably is.