Well done for stepping up and taking on the responsibility. It can be difficult to find people who are prepared to "put something back" and get involved in the running of clubs, so you will make a difference - even if you don't get a lot of thanks directly for it.
The advice on this thread has made you aware of the pitfalls, but I know from my own time serving on various (non flying) voluntary committees that you can build up some cameraderie and really make a difference. The Secretary is the anchor of a good club, and I'm sure that coming in with a fresh view and some enthusiasm will help.
Good luck