'I just think I might be able to help nip in the bud any of the sort of idiocies some schools seem to be prone to as mentioned on here...'
It would be better to forget about that before going to be a parent governor!
For about 90% of the MN threads there will be educational reasons for teachers' actions, and the problem in nearly all cases will be bad communication.
As a parent governor, you will find out many of the constraints that schools face, both financially and administrationally. You will find out about the screeds of paperwork a head teacher (and chair of governors) has to sift through. You will be a mouthpiece for parents, and, in this role, have to show discretion and loyalty to the school.
It will put you in a different position in the playground, and you need to consider this. You will not be able to take part in any gossip about members of staff (not saying you do anyway ) or discuss anything that goes on in meetings, as they are confidential.
However, it is a positive way of finding out about current educational standards, ideas, economics... You will find out where the school is headed, and take part in that development. You will probably be given an observation to make either to do with your expertise or as a visiting governor to a class (focussing on a subject). This is not a judgmental position, but one where you talk to staff, see what they think, enjoy the children and report back to governors.
Your local authority should run an interesting introductory course.
Good luck!