Chairing for dummies

Ensure the meeting is Quorate (and remains so)
Deal with each item of agenda business in order
Each Motion needs a proposer and seconder before discussion
The proposer can have ten minutes, all other speakers five minutes
Try to balance for and against discussion once seconded
Ensure each Member speaks only once on a motion
Suspend discussion whilst procedural matters are dealt with
Amendments are like mini-Motions- they need proposing, seconding, discussion and voting on
Ensure Amendments have clarity and are pertinent to the original Motion
Do not accept another amendment until any open amendment is dealt with
Do not accept move to the vote unless everyone who wishes to has spoken or arguments are becoming repetive
Keep discussion on-topic and ensure order
Permit the original proposer to sum up if they choose to do so
Do not pre-judge the mood of the meeting regarding the likely decision outcome
Remain impartial other than when if choosing to speak yourself (if you are entitled to vote)
Casting votes should normally be used to follow the status-quo

The best book about formal meeting procedure is probably Citrine's ABC of Chairmanship.