Hello my Brother,
The answers given by the two preceding Brothers about sums it up! Except I hope you are retired, or independently wealthy???...
Lodge Secretary is the most important and time consuming job there is in a Lodge. A secretary can make or break a Lodge. If they do their job well nobody will notice, if they do it poorly EVERYONE will know who "dropped the ball" because the WM, DDGM, and Grand Lodge will want it fixed. That is why most Brothers don't want the position. Hopefully the outgoing Secretary can bring you up to speed before his term is over.
Best of luck my Brother.