Copywriter, Proofreader & Alpha Tester

I am looking for someone that will handle all my wording needs for about 17 projects that I'm working on. Below are the requirements. Basically I need someone that will do all the copywrite work on any of my products, the words need to be marketable with excellent grammer. Some of these products require little wordings, while others may need extensive wording and probably documentation/help file. Either case I need someone that will be able to understand the system and write up documentation, give ideas and test while they get to know the system. I plan on launching these applications between now and the next 8 months, right about 2 per month, so speed and availability is a priority. #1. Copywriting skills #2. Proof Reading skills #3. Documentation #4. English language Plus #1. Alpha/Beta Testing #2. Ideas on improving products #3. Multi-lingual