If you are just starting out on eBay I would suggest to start off by selling things around your house to get some experience in selling on eBay. This time of year is also a great time to get deals online and in retail stores. Take your deals and turn around and resell them on eBay. You can find out what the top 10 searches are on eBay at Link hidden: Login to view
Once you get some experience and feedback then try to figure out what you want to sell and start looking for a supplier or dropshipper. I would definitely not start out with electronics. This is a huge category and you will have lots of sellers to compete with therefore making profit margins very low. I would suggest selling something that not everyone else is selling. Maybe make your niche a interest or hobby that your interested in.