Reddit mentions of Mobile Forensic Investigations: A Guide to Evidence Collection, Analysis, and Presentation, Second Edition

Generally speaking, your IT background should allow you to get into an entry level forensic position (though there aren't a ton of those). Public sector would be your best chance, but as has been stated most of those positions are sworn if it isn't a large agency. At one training, as we discussed our backgrounds, an officer stated that he was sent because he was able to help the Chief at his agency put an icon on his desktop. A lot of it is push button with procedures being the thing we worry about most. It's the non-lowhanging fruit that will require some IT skill.

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3 to 4 years of IT experience should get you an interview. From there I would just read of on forensics in general and not worry too much about certifications. Most are vendor specific and each department/company is going to dictate what you use and most likely pay to train you.

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On the mobile side I would suggest this book:

https://www.amazon.com/Mobile-Forensic-Investigations-Collection-Presentation/dp/1260135098/ref=sr_1_4?keywords=mobile+forensics&qid=1559139135&s=gateway&sr=8-4

I read the first edition and it was really spot on. Covers everything from seizing the device properly to performing an extraction and then presenting the data.

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You should also start learning Python. The above book covers part of it and I use it almost daily to make things easier. Also, I build tools to help myself and other investigators so it is really a tool you should have in your arsenal.

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Good luck!