Bob,
Welcome to fun! We deal with a few attorneys so I will throw in my two cents worth for you:
... I was going to recommend to my client that they set up an account and blog away!
My experience is that every attorney wants to blog until it is time to blog and then......
...now I have to "ride" my client to get busy and start creating content.
I do not know that you will have success with this on a couple of levels: they won't like being pushed and, if you have not spelled out the relationship regarding who is responsible for content, they may resent it.
I feel like I want to do more for them on the blog side to keep things going but not having a law background, probably not doable.
I will tell you what my head of development has said to me along these lines: "This is not your job. We do not need you doing this, we need you moving the company forward! This is a low return item for you." Now, you may be smaller and having to do more, but you need to weigh you doing it against what else you could achieve by you not doing it. Ask yourself what your role is.
Do most SEO's do the blogging for their clients, farm it out or keep pushing their clients to do it?
I don't think there is a "most" in terms of business practices. (I do occasionally write something if it is moving a major client project along - once every two months a page or two). You can farm it out, but do it on a basis of paying per piece if accepted. There are several copywriting sites you can look at). We have hired copywriters from major colleges here on a parttime / paid intern basis and some of them have worked out great. You have to have time to spend with them early on to teach them CMS, on page SEO to a point, .etc. (Maybe 10 to 20 hours tops). You would be amazed what they can write about given the right background material to research. Since it is law i would be happy to share a few pointers via phone or email on this.
I also want them to sign up with articlebase but the same thing is going to happen. I have to push them to write articles. I guess this is my job?
I am not familiar with Articlebase, and don't have time to read their terms, etc. If you are simply giving them articles, then hoping someone picks them up, there may be some better legal publishers to look at.
As to the last ?: I guess this is my job? NO, it is a massive opportunity for you to provide exceptional service and make a great return for that! Get them first to understand why they need to post content (blog, articles, PR, etc.). Then show them they will not do it due to their needing to handle their business. Then decide what amount of profit you want to make in order to provide them this service. Add the cost to provide it to the profit number and show them how you are going to benefit them by providing the service for them. That is what a great SEO/CEO would do!!
Good Luck!