Answer to question one: It is called a Crew Centre and there are many ways to build one. I’m sure you can find how to create one here on the IFC in the third party tab or such. So far I know you can make one at PHPvms yourself, or on VACenter and VAHost
Answer to Question two. You can make your quiz on Airtable, Google or any other site where you can create questions and answers and view the scores. it is your decision! Some VA’s use airtable I think as well. I use google forms as I think its the easiest, but your choice! I recommended doing the best for you!
Answer to question three. It is fully your choice! I recommend having Reaction Roles bot, Aircraft Experiment, YAGPDB and MEE6/Dyno. I prefer these bots as I am used to them, and know my way around them. I strongly reccomend you having bots for reaction roles, so you have other roles for pinging. (i.e Announcement Ping) and also bots for Moderation, and welcome messages.
I might have to double check on how to make Crew Centres, however I linked two that I found good for a start. Good luck with your VA/VO in the near future! I hope I answered these questions alright.
I’d also recommend looking at the IFVARB FAQ Here: IFVARB