Reddit reviews The Accidental SysAdmin Handbook: A Primer for Early Level IT Professionals

https://www.amazon.co.uk/Accidental-SysAdmin-Handbook-Primer-Professionals/dp/1484218167

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This is a great resource for moving into a more traditional sys admin type role. Takes you through a very broad overview of all of the common, traditional tech used in small to medium (and large) organisations.

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Aside from this, learn which OS they use for their servers. You'll probably want to pick up some basic Linux terminal/Powershell knowledge and also learn some basic networking skills.

I would skip certs for now, only because you need to get up to speed quickly.

I would check r/sysadmin and see what they think.

if you want some advice for books and such, then I suggest the following

1)

Networking for Dummies: - You can probably get this one free from the library. I think my library has it

https://www.amazon.com/Networking-Dummies-Computer-Tech/dp/111925776X/ref=asc_df_111925776X/?tag=hyprod-20&linkCode=df0&hvadid=312114711253&hvpos=1o1&hvnetw=g&hvrand=472462205621134697&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9019032&hvtargid=pla-327835119737&psc=1

This will give you an over view of networking.

2)

The Accidental SysAdmin Handbook: A Primer for Early Level IT Professionals 1st ed. Edition

https://www.amazon.com/Accidental-SysAdmin-Handbook-Primer-Professionals/dp/1484218167

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Understand the concepts, processes and technologies that will aid in your professional development as a new system administrator. While every information technology culture is specific to its parent organization, there are commonalities that apply to all organizations.

The Accidental SysAdmin Handbook, Second Edition looks at those commonalities and provides a general introduction to critical aspects associated with system administration. It further acts to provide definitions and patterns for common computer terms and acronyms. 

What You Will Learn

• Build and manage home networking and plan more complex network environments
  
• Manage the network layer and service architectures as well as network support plans
  
• Develop a server hardware strategy and understand the physical vs. virtual server ecosystem
  
• Handle data storage, data strategies and directory services, and central account management
  
• Work with DNS, DHCP, IP v4 and IP v6
  
• Deploy workstations and printers
  
• Manage and use antivirus and security management software
  
• Build, manage and work with intranets and Internet support services
  
  Who This Book Is For
  It is assumed that the reader has little to no experience in a professional information technology environment. 
  
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3. Time Management for System Administrators: Stop Working Late and Start Working Smart 1st Edition
   
   https://www.amazon.com/Time-Management-System-Administrators-Working/dp/0596007833
   
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   Please note - I'm not a system administrator

I would look into completing the triad of A+, Security+, and Network+ long term.

Here is a book that might help you on your way and is appropriately named, plus one other book I like

https://www.amazon.com/Accidental-SysAdmin-Handbook-Primer-Professionals/dp/1484218167/ref=pd_sbs_14_1/157-3685118-2307823?_encoding=UTF8&pd_rd_i=1484218167&pd_rd_r=YGE1VXYEB8868B4ZE438&pd_rd_w=UiuwT&pd_rd_wg=gGWFI&psc=1&refRID=YGE1VXYEB8868B4ZE438

https://www.amazon.com/Network-Warrior-Everything-Need-Wasnt/dp/1449387861/ref=sr_1_1?s=books&ie=UTF8&qid=1484232367&sr=1-1&keywords=network+warrior