Go to clickbank and search newest product to promote.. Use free tool from cbengine to search new product.. Promote directly with push ads for cheap.. Better if you create landing page to promote
It's not that easy to answer, as you can choose from different directions, but I would recommend that you first determine your niche and find the ones that you would feel most comfortable in, then research the market and see with how many competitors you would face as this will help you to better determine your strategy, see which affiliate networks you could join, find what are their requirement to try to fit inside of them, and so on.