Hi babydoll85,
Welcome to SaleHoo! It is not really easy to tell what will sell best, but a lot of factors will come into play which you need to be aware of to help you prepare and succeed. How you sell is just as important as what you sell. And to have a clear idea of your goals, you need to write a business plan. It would be best to map out several product ideas at the outset, so that you will be less likely to give up when your first one doesn't work out. :)
Among the steps you need to do - know your target audience, carry out market research, test your product by selling a sample lot, examine pricing and competition. :)
You may also use our Research and Analysis Lab to help you decide what to sell. :)
Richelle has been writing great blog posts that give you different ideas for markets to investigate further and possibly get into. You may read several product ideas at Link hidden: Login to view
Let us know if you need further help. :)