Article writer/content creator

I need 50 300-400 word articles on ten different subjects. Articles should be researched online for at least 10 minutes. The articles need to be useful and informative. They should be grammatically correct and written in United States English.

I need to know how long you expect this to take and would like to see three to five samples of articles you have written.

If we work well together this can become a full time/permanent position for you.