There's already a NOOB thread,got lots of good info:
https://xdaforums.com/nex/help/help-thread-question-noob-friendly-2018-t3806039
You don't have to do anything special to get it working on T-Mobile, it'll automatically select the proper APN.
As for getting it set up for Google services:
Go to the VIVO App Market (no VIVO account needed for setting up GOOGLE) ,then type google and you will see:
Then click "下载" button on the first app ,then it will download and automatically install on your phone.
Then go to your phone's "file manager " and go to button and you will see this app:"Google Play1.apk",then click it to install.
And you will see this :
Click continue installation button to install it,then Google Play will work.
ATM, there's not a lot to sort through, give all the threads a look, you'll get an idea of what to expect before you get the phone in hand.
Sent from my HUAWEI BKL-L04 using XDA Labs