i think groups are ad hoc
You can either have a watchfull eye on clanchat recruiting for your desired voids or host some yourself, if you are low on keys make sure to add the magick "Keyshare" .
With your setup you could even solo most t1 missions md&def may get messy though.
Captures can be done mere minutes all you need to do is kill 2 targets in-peng-out.
T1&2 are fairly common but t3&4 not really so be wary of scammers from recruiting on the rarer voids.
I've asked around a bit but am unable to really get anything going.
And when people post in chat I am always too late hehe, (100% my own fault).
No worries you'll get the hang of it, just make due on what you have and you'll be perfectly fine. The other prime parts will come in time - or from trading
2 habits you should avoid like the devil the holy water are begging for help with voids and randomly invite spamming.
(i felt compelled to mention it as we had some troubles with that behavior lately)