Serving on national committees

I am new as a Writing Program Administrator. I feel somewhat isolated since I oversee advanced writing in the College of Family, Home, and Social Sciences. I am not affiliated with the Writing Program in the English Department, although I taught there part-time for several years.

One of the conditions of my employment and tenure is that I serve on national committees. How do I go about doing that? What national committees are relevant to my work?

I would appreciate any help and insights!