Hi Exentenzed 
You shall be most welcome in our guild! regardless if you join now or later ^^
We are a lot of new or returning players as said, and naturally we will help teach what you might not all ready know. Also on our discord there will be guides suggested etc.
When we run M+ with people who are new to affixes etc, we are always looking to go full guildgroup, to reduce stress and create positive experiences ^^
With the prepatch downloading in the background, the majority of our guild took a break. But there is at least 3-5 ppl minimum online usually, and everybody can be reached through Discord. I think everybody is just really done with BFA and wait for prepatch to hit 
Feel free to add my btag when the time comes