If you have to earn $50-$100 commission you have to sell product of cost $500-$1000 (If you’ll get 10% commission). If anyone who is reading have the potential to sell product of this much amount then why not he/she should start selling his/her own product. And money ultimately comes when a service or product is sold! So if you can write an Ebook then write another which you can sell for money!
Will my target audience realistically buy this now, or at a different time? Be sensitive to sales cycles and seasons. Maybe you should avoid holidays (when people are away from their computers, like July 4 in the U.S.) or maybe you should target holidays (like the day after Thanksgiving), but know the difference. Again, know your audience. Plan your content accordingly.
Traffic exchange users are comparatively low quality, but they’re still real humans. You’re getting real people to view your site, you’re just not bringing them in organically the way Google intends. You can make money from these users, but your conversion rate will be typically lower than what you might see from organic traffic. Of course, it’s also much cheaper and faster to find this traffic than it is to invest in SEO and content marketing.
I find that everything you need for AdWords can be given to you by using the Adwords Campaign Management dashboard, keyword planner tool, and other search engine keyword tools. Essentially, you're looking for keywords to target on search, but instead, you're paying for it. What tools you use depends on your paid search strategy - you may want to target paid keywords that you don't / can't organically rank for (which would be a wise decision). However, if you want help chosing the best keywords and reporting on campaigns, other tools that you can use include: