Yeah, there’s a sort of standard way of doing it, hang around in the group finder chat tab and there’ll be someone advertising for a team within a few minutes. Once the four of you are assembled in Navigation, you have a quick chat about who’s happy to wear what Dragon key, and in you go. Once you’ve joined a team a few times, you can form one the same way.
Caveat about all this: I used to do Corrupted mods a fair bit, but that was back when “endless” (the endlessly scaling Void survival and defence missions) was a thing. In those days everyone built around that placeholder “endgame,” and extreme min-maxing was necessary, and that’s what the Corrupted mods gave you (everyone in the team would have their frame built to the speciality of the frame only, so the sacrificed stat wouldn’t matter).
Since the relic system was introduced, there’s not so much incentive to do endless any more, at least not to the levels people used to do it (beyond 40 mins/waves or so), so there’s not so much incentive to do those extremely min-maxed builds any more, so I’m not 100% sure that farming Corrupted mods is as good business as it used to be. But I still see regular calls in trade chat for Fleeting Expertise, Blind Rage, Overextended and Narrow Minded, so it’s probably still a good way to go if you want to get a steady plat income. I think people still use the Corrupted mods a bit, but rather than swallowing the sacrifice and min-maxing, people tend to compensate for the sacrificed stat and keep things hybridized with just the extra bump from the maxed stat poking out a bit (as it were).
The real “grown up” mods these days are the Primed mods - Primed Continuity and Primed Flow, and some of the weapon ones. They take ages to fill the last couple of pips, but once you’ve got them build flexibility is increased dramatically (mainly because of the decent compensation to Duration that Primed Continuity gives over vanilla Continuity when you’re using Fleeting Expertise). It’s definitely worth watching Baro Ki’Teer’s appearances like a hawk and snagging primed mods when they come around, or getting them from trade if someone’s selling them un-filled (or even filled, if you can afford the huge plat cost). Note that Ki’teer’s things cost both credits (quite a lot) and “ducats”, a currency you get from him by selling him prime parts. Also note that the tax for buying primed mods from players is humungous.
Re. farming: I think most players do a blend of farming for plat to buy stuff, farming and grinding for specific things, and buying a bit of plat with real money now and then (when a discount swings your way as a login reward). The game’s set up nicely so that you don’t feel you’re cheating or doing anything “wrong” with any of the pay-to options, at least I don’t. Most of the time it just feels right to farm for things, because you do get that sense of satisfaction when you’ve worked for it, but sometimes if the RNG doesn’t go your way for too long, or you just want a thing NAAAAOOOWWW, that option’s there too, since you can eventually accumulate a fair amount of plat from just playing casually and selling mods and prime parts.
