Research

I found some interestings websites which are able to help with writing an artist statement;

http://www.mollygordon.com/resources/marketingresources/artstatemt/
http://www.ucreative.ac.uk/index.cfm?articleid=18407
http://www.artistsfoundation.org/art_pages/resources/resources_arts_statement.htm

After reading this tutorials the most relevant information I would extract from here that I would use in my artist statement as well would be the following,

Background
Why did you get in to this
Are you a student or a practicing artist?
Work experience

What your motivation is for the work you do
What issues are you exploring and why?
What concepts, themes or convictions underpin your work?
How does your personality influence your work?
How have your ideas developed?

The techniques and materials you use
How and why did you choose them?
Do you have a particular process of working?
What is your favorite tool?
What is your favorite material?

I think that these points would all together sum up quite good what I would want to express and bring across as an artist. I have choosen these points, because to me these are key points that I would like to know as well if I would come across an artist whose work I liked and wanted to find out more about his background and previous work experience.