Hello Marcus
You are very fortunate to be training with Graham Morris, he is a very good sensei. Graham & my sensei both trained under Chiba sensei in England & share that crisp no non-sense style.
Everyone has offered you good advise regarding seize & dizziness durring Ukemi, so I will offer you the Data base you are after it is on the QLD Aikikai website.
http://www.aikido.org.au/qld/rules_glossary.html
as for etiquette you would do best to talk to the senior students in your dojo for advise to your particular brand of etiquette.
Good luck with your training.