Are sellers required to provide a tracking number? No, sellers are not required to provide a tracking number however providing a tracking number provides evidence that the seller shipped the item.
How long does the seller have until he or she must ship? After payment has cleared sellers should always ship soon as possible. Sellers must to ship within the timeframe that it says on their listing i.e. Will usually ship within 2 business days of receiving cleared payment.
Am I required to give feedback because eBay is reminding me? No you are not required to give feedback after each transaction however it is highly encouraged that you do leave feedback.
When leaving feedback I made an error how can I change my Feedback? In general once you leave feedback the feedback that you left cannot be changed however for sellers who meet these requirements may request negative or neutral feedback to be revised if he/she has worked out issues with the buyer.