First off, congratulations! Sounds like you have a great attitude and are already off to a good start.
Think your introduction letter sounds like a fabulous idea. This may go without say but, would caution you away from talking about the lack of communication in the past. Stay focused on what the new board would like to do and keep it positive.
I went through our file exchange to see if there was any existing letter that match your request but didn't find any exact matches. There are a bunch of letters that you may be able to use pieces of to create your introduction letter.
Hope this gives you a place to start. We'd love it if you uploaded your letter to our file exchange once you are done : )
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