There is a lot of documentation online so remember Google is your friend. It may be worth getting your group to collaborate on an internal document that has useful commands that you actually use. This will be great for onboarding new team members and will narrow in on commands that your team actually uses.
When testing there was a reasonable delay on sessions starting new sessions. I found that if you left the web page it would start eventually. Feel free to try refreshing your browser page or going back to you home area. This may not be th case when the cluster has more resources.