There are couple of organisations which they follow called "Clean your Desk". On last working day of the week, during second half two hours are given to people for their desk. We follow too. The objective of this activity is -

1. To clean mail box, destroy useless papers, file the relevant papers in files etc.
2. Most importantly, to plan out the entire work list priority wise for next week
3. To bring a sense of cleanliness

During these hours, no meetings / presentations are scheduled and people are busy on their desks cleaning and making worklist. This small activity really makes a lot of difference specially in prioritisation.

Telephone etiquette - You can get these informations on websites or people from Call Centre will be able to help you out more specifically. Infact, you also get books.

Email etiquette - This is the most important, which is abused at most of the places and if each desktop is attached with Internet, then a lot of effort to be pulled. Probably IT Policy of the company can be part of your presentation.

Probably, you can also include "How to attend / conduct meeting".

I can't make any comments on use of toilets, parking places, lawns, dress code, which will be very specific to your organisation and its' building & surroundings.

Hope this will give you some thread.

Regards

Amarjeet