I wrote down my experiences with building delivery platforms, which answers some of this. Might be interesting https://blog.brujordet.no/post/devops/building-a-delivery-pl...

But with regards to purely technical stuff like what tools to choose and how to use them you’ll need experience, either your own or someone elses. There’s really no replacement in my opinion. I had loads of experienced people around me previously, but now that I work more or less alone in the field I rely a lot on community slack channels for the various tools and debugging. It’s amazing to be stuck trying to figure out how to best use Loki for logging, jump on their slack and get advice from the Lead Engineer working on the tool. Or getting input on what tools to use from 50 different people in different companies through /r/devops on reddit.