1) Google Adsense
1) Google Adsense requires very little, like enough content (blogs that are commented on constantly help), a sitemap, and that is all.
2) Google Adsense is PPC, or Pay per click, so if no one clicks it, you earn nothing so you need traffic.
3) Experiment with the banner size, length and width.
4) Put most of Google Adsense on the blog.
5) Make sure the ads earn money.
6) Try to add other ads, like Chitika, Bidvertiser, etc.
7) Follow the rules of Google Adsense.8) Make sure that it seems like you didn't mean to advertise, like the ad belongs there.

A Google Adsense ad looks like this:
2) Donations
1) You MUST need very valuable content in order to do this.
2) Constantly update your website.
3) Write ''Please donate, we need money to sustain our website, or we will have to charge money for this information.'' or something like that.
4) You need high traffic for this method to work.
5) You need a good topic.
6) Use Paypal's Donate button.
3) Chitika
1) Chitika , like Google Adsense, requires high traffic in order to earn money.
2) Chitika needs enough content so the ads will be relevant.
3) Follow the private policy.
4) Do what you did with Google Adsense.
5) Make sure that it seems like you didn't mean to advertise, like the ad belongs there.

Click here to sign up.
This is a Chitika Ad.
4) Bidvertiser
1) I don't suggest using Bidvertiser, because it's ads are usually unrelated to your content.
2) Just put it somewhere you don't need.
3) Make sure that it seems like you didn't mean to advertise, like the ad belongs there.

Click here to sign up.
5) Blogs
1) Find a good blog. They sometimes pay you if you blog. Examples are Payperpost, BlogVertise, ReviewMe, SponsoredLinks, and Smorty.
2) Make a blog, put so much valuable content on it that readers will stick around, comment more, and come back after you add more content, have a RSS Feed. Then put ads on it.
6) Text-Link-Ads
1) Although I rarely use these, I heard they are very great, so I'll give it a go. I recommend them for you, if you don't like it, use a different one.
7) Amazon Affiliate
1) You just put a banner up, linked to a product on amazon, and if someone goes through your link, and buys something, you make money/10% of the money spent.
2) Although I don't suggest doing this, some people use this for a 15% off. If they buy something through their own banner, they gain the 15% back!
8) E-bay Affiliate
Same concept as Amazon Affiliate.