If you are able to invest in some training then this course is designed especially for the experienced person such as yourself to get up to speed with Go quickly. This is top notch training that I can personally recommend very highly:
There are also some courses on Udemy which may be of interest. Check out the Go training by Todd McLeod - they are excellent value for money. If you are quick you might still get this one for $10:
https://www.udemy.com/learn-how-to-code/learn/v4/overview
Beware though, there is some dreadful (IMHO) training on Udemy for Go too.
However, If you are disinclined to pay for training there are a wealth of free tutorials out there too. Try YouTube. This one always makes me laugh:
I can vouch for the Go Programming language book:
https://www.amazon.co.uk/Programming-Language-Addison-Wesley-Professional-Computing-ebook/dp/B0184N7WWS/ref=sr_1_1?ie=UTF8&qid=1511903240&sr=8-1&keywords=the+go+programming+language
Ultimately nothing beats just picking a project and writing some code in Go. I think you are going to love Go.