How Do I Get Ready for Managing a Linux Server at Work?

I've been working as a helpdesk tech for about four months and primarily use Ubuntu on my personal devices. However, my workplace is largely Windows-based. I just found out we'll be collaborating with a vendor that needs us to set up and maintain a Linux server for their software. Since I use Ubuntu at home, I've been tasked with implementing and configuring this server. Unfortunately, my Linux knowledge is pretty basic—mostly limited to commands like 'cd', 'ls', and 'mv'. I've expressed my concerns about my lack of experience, but they just say I know more than they do. I'm looking for advice on what steps I can take now, especially since there's no clear timeline yet. I truly want to gain this experience and love working with Linux, but I'm feeling a bit lost. What should I do to prepare and not just 'fake it'?