To succeed, you need 2 things to start with:
1- Learn internet marketing - there are plenty of free training programs available online.
2- Focus on ONE niche and product, for starters.
Make a success of it - yes it takes time and effort but it does get results. Then sure try another product or niche after and make that a success and keeep going.
Oh, and NEVER give up but always learn lessons form whatever you do. Look back, did it get you what you wanted? If not why not, if yes how (& repeat the process).