Welcome Mastodon newbies!
DO
- Add a bio with pics and #hashtags of your special interests
- Use #AltText on Images
- Write an #introduction post
- Try out your server's custom emoticons
- follow your server admin team (mine is @ohai)
Don't - bang on too much about the bird site 
Some of my fave Ohai emoticons: 
@srfirehorseart @ohai thanks for the tips. Did not understand.
Are there tutorial videos of how to use the platform?
Basic. How to find followers.
Push this button. How to respond? Can I post video?
Waiting for my crew to migrate.
A simple welcome video to explain basics without tech terms understood by new users.
Yes, there are lots of user guides on the @feditips website.
You get followers by engaging with other users and adding topic #hashtags to your posts.
Basics:
https://fedi.tips/mastodon-and-the-fediverse-beginners-start-here/
Find people to follow: https://fedi.tips/how-to-use-mastodon-and-the-fediverse-basic-tips/#HowDoIFindPeopleToFollow
Yes, you can post video.
"On Mastodon, you can attach up to four images, or one video file, or one audio file when making a post."
https://fedi.tips/how-to-use-mastodon-and-the-fediverse-basic-tips/#WhatCanIAttachToAPost
Firehorseart Lives!
BUD