Some questions:

1. The headline says "creating backlinks" but your question seems to be about content creation. Do you have a clear keyword goal in mind for the blog?

2. Will the Typepad blog be hosted internally within website architecture or will it live completely externally on the *.typepad.com RD? If the latter, how will content creation drive SEO value to your client's core business  site? What is your goal with the Typepad blog: to create inbound links to the law firm's website, or to generate leads via blog content?

Brian

PS: your job goes far beyond riding them to create content: you have to give them clear business reasons why they need to do it, what the expected result is, where the value lies. As lawyers they have liabilities if they give legal advice on a blog, and they can't risk offending potential clients or speaking on certain topics if it entails a conflict of interest. There is no harder industry to blog for than the legal profession, and most lawyers are not professional copywriters.