Two-tier programs exist in the minority of affiliate programs; most are simply one-tier. Referral programs beyond two-tier resemble multi-level marketing (MLM) or network marketing but are different: Multi-level marketing (MLM) or network marketing associations tend to have more complex commission requirements/qualifications than standard affiliate programs.
I’d stick with Amazon if I were you. All of my Amazon sites only have Amazon affiliate links. If you use Google Adsense display ads on your site, you’re literally taking people away from your site for the sake of just a few cents with these type of ads. If you direct them just to Amazon, then you have a greater chance of earning more money from that click.
Within 3 months of being let go, I was working for three different companies remotely in digital marketing that not only paid my bills, but allowed me to build a network of new contacts, and led to a new career path. In those three years since I’m now a Digital Marketing Senior Manager at a great software company called EveryoneSocial and I provide digital marketing consulting for other companies and startups that all improved my career worth.