Comment by greybox
I recommend skimming over the first few chapters of crafting interpreters, the main value there is the recursive descent algorithm and abstract syntax trees, the rest is implementation. I've been developing my own language [1] and that's how I got started
The ideas in crafting interpreters are not language specific, the examples are in java, but I used C++ for instance. Im sure you could transfer the same ideas to Go. Then again I've never read the go book you are referring to