Hi there, I am Australian so English is my first language. I am an experienced blogger and have recently started to look for work in copywriting and content writing. My values include Professionalism, Integrity and Attention to Detail.
Here are the answers to your questions:
1. My rate for 100 words is $1 per word. Now, I personally do not like charging by the word, I feel it turns my writing into a commodity and compromises quality over quantity. So, I would be happy to discuss an hourly rate moving forwards.
2. The English version I use generally is UK English as I am Australian. However, I can write in US English.
3. Depending on what you want articles on, will depend on the amount of research required. I could comfortably say two articles a week to begin with, and once I know your content needs, this may be able to increase. I would be keen to discuss this further with you as I am flexible.
4. I am just starting out in copywriting so I don't yet have references, I am happy to provide writing/editing samples if you are interested in moving forward with a work proposal. I have articles I have written with my name, and as a ghostwriter, as well as my personal blog.