Not to pile on, since you've already researched a few things, but I'd recommend some additional resources, just in case you haven't seen them before:
SQLSkills is once place I stop often to find good information, and Erin has some baselining topics:
One is her Accidental DBA entry on baselines:
There's a pretty good video on the PASSTV channel on Youtube:
I've set it to a point in time where they start discussing what things to capture, but you should check the whole video as they describe what baselining is about.
Note that some of the typical baselining topics (particularly Page Life Expectancy) have changed in priority over the years. The video discusses that, as well as some other counters. Disk I/O in particular has completely changed in the past 10 years with SSDs, any baseline or collection advice on that needs additional consideration if it's more than 5 years old. For instance:
Allen discusses some counters and attributes whose relevance has changed over time, but IMHO his overall approach is a bit outdated (the presentation is 7 years old at this point). There's still useful information, but I don't know if his techniques would help you. PowerShell does make it easy to collect performance counters and extract Windows logs, that is definitely worth your time if you haven't considered it yet.