Amanda, you've covered some major pieces of the puzzle so far

I think one other thing you might consider (and I think you've actually done this but I can't recall for sure) is to create a portfolio of sample work: ALL of the marketing materials you create for your own business can be included and your newsletter idea is a great way to establish yourself as an 'expert' in your niche.
Did you ever figure out how to add a blog to your site? If you enjoy writing that can be an excellent way to establish your business entity even more so - people (potential clients) migrate to intelligent resources of information - and so do the search engines!