When first starting off making this money can be hard, but you should never give up!
I would suggest you need to find a category (niche) that you enjoy writing about. Once you have found this niche life becomes much easier as you can simply write about you niche on a blog and then at the end or during you articles you can link to these affiliate programs from places like clickbank. Be aware that what you are linking to from clickbank should be in the same niche you are writing about. For example say you write about music, then you find affiliate programs on clickbank are related to music!
Hope this helps you out!