Most affiliate marketers chase the same ol' CPA / lead offers from networks like NeverblueAds, Copeac, Azoogle, Advaliant, FireLead, ML, etc. etc. etc.
Nothing wrong with that, but most such lead / cpa offers are not for long-term business. Offers come and go. That's why they're called "offers". They have a finite lifetime.
I suggest you try out physical products instead. Find yourself a niche of interest, and build a site around a product or some products in that niche. Check out networks like CJ and ShareASale and get their datafeeds.
Many physical products have longevity and will have sustainable consumer interest for many years to come. Think about it - many different ringtone/green tea/iphone/zip submits etc. will come and go. Rules for these will also constantly change because many marketers try questionable tactics of promoting them - and hence, the advertiser is forced to tighten up.
On the other end - there are thousands of physical products that there will always be a demand for and that people actively search for year in and year out. If the cpa / lead offers don't work for you, go with this model.
Btw, you will experience a much more stable income with this once you find something profitable. Product merchants' policies rarely change like they do with lead offer advertisers.
Or - make some money on the side of this by building some lists with Aweber for cpa / leads.