In order to make money with Adsense, you need to find a profitable niche. When you are just starting out, you should pick a niche that you have some interest in. By doing this you will be more interested and it will not be quite as challenging for you to write your articles. If you are interested in gardening, you could write articles about different plants, soil conditions, watering, the best planting times or even about those pesky insects that invade your garden. The possibilities are limitless. When you become more comfortable writing articles and have your site profiting for you, you might then try a niche that is new to you. Go to the search engines and do a search for whatever niche you want to try and research that topic. You might find that you have more of an interest in that topic than you thought.
When writing your articles, be precise, be informative, and by all means, don't tell them the same thing that everyone else is telling them. Make your articles new and interesting. Give them unique content. Don't write one or two articles and think that will be enough. You need to keep writing, keeping your site full of fresh content. Don't forget to put your name and website address at the end of your article in the resource box. As you write articles that are interesting, other website may pick up your article and publish it on their site or in their newsletter, thereby driving additional traffic to your site.
By keeping your content fresh and informative, the search engines will spider your site more often. The search engines love new and unique content. They will make numerous trips to your site if you keep adding to it. The more often they visit, the higher in the ratings you can go.