Hi Andrea and welcome back,
It's one of the most common questions we see here on the forum, but it's impossible to answer with any sort of clarity. If I say you should sell iPhones because they are one of the hottest selling items on eBay, could you compete with other sellers already selling them?
See, suggesting products really isn't of any use at all. There isn't really anyway around it, it all comes down to research to find a market where you can compete to give yourself a chance of success..