I buy and sell lots on eBay, and have a great time!
1) As a newbie, never buy from a seller with less than 50 feedback and NEVER buy from someone who has feedback that is 97% positive or lower. I know 97% positive sounds good, but it is not! It is actually quite poor. Only buy from sellers with 98% positive feedback or better!
2) Understand, please that eBay is just a place where buyers and sellers meet. You are buying from a private person who wrote the add. Some of the people selling are great, and some are not, so it is important to read the add very carefully and to CHECK THE FEEDBACK.
3) If you have a problem with a seller or a buyer, please try to work it out with them before you leave a bad feedback. However, if you buy from sellers with 98% positive feedback who have over 50 feedback comments, chances are you won't have many problems.
4) Make sure you know how much shipping is before you bid.
Have fun!!
-Lisa