Clearly, paying for ads and other initiatives is always one method to drive traffic to your site or blog. If you have a small budget, and you track things properly, you can come up with a cost-per acquisition (CPA). If your CPA is high enough, you can comfortably scale your advertising revenues. Be sure to implement things like Facebook and Google tracking pixels to determine the effectiveness of your ads.
Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.