Don't fake it! If you are going to write a review of a product, test it first. Readers will be able to tell you are lying and if they can't, they will certainly know when their experiences are nothing like yours. If you are dishonest, you will lose the customers you worked so hard to gain.
If you are repeating something that you saw on another person's site then you need to be sure to give them credit for it and provide a link back to their site. This will save you from having anyone upset with you and it will let your users see that you are noble and can give credit when it is due.
Avoid using "marketing language" within the article itself. Articles should focus on some aspect of your market in general rather than directly pitching a product or service. The place to get your marketing in is in your short call to action at the end of the article. If the content of the main article is congruent with the call to action, the reader is more likely to buy.
Use SEO keywords in your articles. Sometimes people who search for a certain term are more likely to buy what you're selling. Don't overdo it, though. If you stuff your article with keywords, it will read unnaturally to humans and search engine spiders will penalize it as potential spam.
If you are just starting out, choose only one article directory to work with. Look through each of the article directory databases to find out which one would suit you best, and work towards familiarizing yourself. Only using one directory will help you learn the ropes before you dive headfirst into the field.
Of course you know that every mistake should be treated as a learning opportunity. When you are in the article marketing field, though, mistakes are even better than education. They are fresh topics for your articles. Write an article about your mistake! Teach your readers what you did wrong and what they can do right, in order to avoid your error.
Steer clear of using automated content generators when launching article marketing campaigns. They can provide many articles in a limited amount of time, but many will not guarantee quality. Many of them probably won't even use standard English. You may as well write your own articles. After you have been writing for a while, it will be easier to create content.
Finding a successful article marketing formula is important if you hope to oversee a lucrative, productive campaign. Going about it the wrong way is a colossal waste of your effort. Make sure that you're not wasting time and money. Follow what you've read above to build your article marketing campaign.