Affiliate marketing will give the better opportunity to make the most money. AdSense will make you smaller amounts of cash regularly with very little maintenance. However, it needs a fair amount of traffic to be really profitable, while you can use a mailing list to sell your affiliate products. You can build up a large list over time, even with a small amount of daily traffic.
You will make an excellent passive income for as long as you want in this line of work. In fact, you will even make money on your old blog posts written years ago, depending on the quality and relevance of your content. Your business will always stay open, and you will have cash flowing into your bank account 24 hours a day, 7 days a week, even when you’re asleep or off on a vacation.
2. Of course, nearly all my readers are using WP so I’m biased. But even so, most successful affiliates use WordPress. There are less restrictions in terms of hosting (site speed), design customizations, plugins, cloaking affiliate links, lots of things. I would setup a free wordpress.com site just so you can play with the dashboard and see how you like it. Who knows, you might find a theme you really like (eg. StudioPress) and want to make the transition. I would at least test it out…it’s better to make the transition earlier than later.
The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you. 
While your site is still new, it's a good idea to start capitalizing on someone else's audience. Continue focusing on building your own content, but also considering writing content for a few big, high-traffic blogs that are relevant for your niche. By writing content for a bigger site, you are able to get in front of another audience and showcase your expertise on a particular topic. This will eventually lead to more traffic to your site, as well. 
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Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.
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