OP:
There are various print and online books that are written to help one "make the move" from Windows to the Mac environment.
It's probably not worth it "asking in advance" like you're doing here, because you're going to figure out a lot of stuff on your own.
If you do get "hung up" on something, that's when it's time to ask about it.
I suggest that you keep your Windows computer available nearby for at least several weeks as you make the transition. This way, if something gets you hung up on the Mac side, you can revert back to "what you know" if necessary.
I don't believe iTunes or Apple Music will play wma files (I could be wrong).
You will need a "3rd-party player".
Perhaps the best way to handle them might be to convert them into high-bitrate mp3 files.
There's a very easy (and free) utility called "ALL2MP3" that can do this.
You can get it here:
Tucows offers Domain Name Services, Fiber Internet Services and SaaS through our businesses Tucows Domains, Ting and Wavelo. We're a tech company headquartered in Toronto, Canada, making the internet better since 1993.
www.tucows.com
Warning about downloading ALL2MP3:
DO NOT download from here:
tresrrr.com
...because they "package it" along with crapware that will also install. Why they do this, I don't know.
But the older version from tucows is fine. I suggest that you DO NOT "upgrade" the tucows version, so long as it works for you.
For "uninstalling" programs:
- Some applications (usually the larger ones) come with UNinstallers.
- There is a small free utility called "AppCleaner" (note that there is no space between the two words) that does a bang-up job of clearing away unwanted apps.
The Applecare extended warranty can be very useful for laptops, particularly AppleCare Plus ("regular" AppleCare and AppleCare Plus are two different things).
Having said that, I've owned two MacBook Pros (2010 and 2015), and didn't have AC on either of them, and both did fine.