Do 2s and 3s and just keep pushing to acclimate. They are very easy and people are chill in them. Observe other players and how they handle mechanics, but a most of it it is common sense if you’ve played WoW enough to know what Blizzard likes to do. Watch some boss guides if you’re really dedicated.
Once you want to push 7 or higher I’d try to do that on a fortified week because tyrannical can brick a key easier than fortified. In my experience pushing up to 6s has been pretty easy; I’ve only tried one 7 that flopped because we wiped on the third boss so the tank rage quit. I may try one more this week now that I have my 8 done, but I’m planning to care more about 7s next week when it switches to fortified.
2s and 3s are so easy it really doesn’t even matter. All I did the first two weeks I started on M+ was just queue for those. You have to be willing to observe what is going on though so you are learning. You could also just do M0s if you really wanted to, but I never even touched em.