There will likely be a lot of tools for your new team member to set up.
On or before their first day, your new start should already have their work email address and should be added to Slack (or another team communication tool). And they should be set up on Trello, or whichever tool you're using for your onboarding, since you've already organized that beforehand.
Now it’s time to set up security measures, and to get your new remote team member set up with tools for password protection, hardware encryption, and antivirus protection.
At Hotjar we use LastPass to keep our passwords safe. If your company doesn’t currently use a tool like this, consider whether it would be useful, as well as whether you need to encrypt your new team member’s hard drive. If they need to install antivirus protection or take any other measures to secure the equipment they're using, help them set that up, too.
If you have an IT team, is there anything that they might have come round and done with a new start’s computer or laptop if they were working in an office? These are things to consider readjusting now that the person is working from home.