A:
Minutes approval is one of the first things, usually right after any opening ceremonies (e.g., pledge of allegiance, welcome).
The election of officers is normally right before Unfinished Business.
(The term "old business" shouldn't be used because people infer it's for business that's already been disposed of.
Unfinished Business is for undisposed business held over from the previous meeting because the meeting adjourned.
There is seldom any.)
Check your bylaws to see what number or percentage of the membership must be present to conduct business.
Look for the term "quorum."
If it's not in your bylaws, then a majority (more than half) of the membership constitutes a quorum.