Great questions @uyobong and for all of your work onboarding new users!
Any way the account is created is totally fine! We just gave a couple examples so people had the information they needed on a few options. However the steemian gets here is great.
Yes - Part of the contest rules is to make a post at the end detailing all the people you onboarded and linking to their intro posts. Make sure they know about this contest and follow the rules detailed above too. They have to mention you in their intro post to count so we can make sure no one scamming the contest.
Great question! A video would be totally fine if they prefer to make video content. :)
There are two components to the contest - individual and community efforts? There are prizes for both individual people who onboard the most ... and then the communities that onboard the most. So make sure to list the community you are mainly part of in your post.
Thank you for the detailed reply.