Step one is to get some questions posted. If you just create lots of forums, its hard to work out what they should all be called, because you don't yet know how the community will react, and what they will ask. If you start creating a lot of Task specific forums, then the comunity members are reluctnat to post if they don't find a forum that exactly matches the the task they are currently involved in.
For now, keep the Forums more generic. Once you get 20-50 posts in a forum, then you can look at the trend, and decide how they should be split up. Community Server has great tools to move threads and posts and to split threads in half and move them to other forums.
Further to this, since its a business oriented forum, rather than thinking in terms of topics for forums, it may be more useful to think of organizing the form in terms of roles.
By making theforum more role based, it will be easier for people to configure things like RSS from a "non-techie" point of view, and set up a reader personalized to the role of that community member. So for instance you may have forums such as "CFO-insurance", "Accountant-Manufacturing" etc. Or even nicer, would be to create Forums called "Susan" "Sean" etc.
But either way, once the community starts posting questions, you will see what forums you need.
David Singleton - MVP Dynamics NAVDynamics NAV Consultant since 1991Available for Navision Go-Live assistance
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