Hey @Kirti Bodhmage
If you're wanting to setup a subscription to our Premium plan, you can do this by going to this link and selecting the workspace you want to upgrade and then choose how often you want to pay (monthly or annually) - https://trello.com/select-team-to-upgrade
You can also go through this link instead if you want a free trial of the plan before you start paying for it - https://trello.com/free-trial
If you're wanting to set up a Trello account you can do this by going to https://trello.com/signup and then entering your email address, once you've done this you can enter your Atlassian password and link Trello to your existing Atlassian account. This'll be the same for anyone who's already got an Atlassian account and wants to start using Trello.
Right now, the best way for preventing people accessing Trello if you don't want them to is to block the Trello.com domain on your firewall for those people and only allow it for the people you want to be able to access Trello. If you don't want to do this though you can use board and workspace permissions to only grant access to your content to the people you want to be able to access it.
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