How do I get people to join my new FC?

[Sakuraluna]

I'm in agreement with Urthdigger here. You have no experience with this game and no aim, except "lots of people to play with". Players generally lean toward either grouping up with friends from other games or rl, or joining fc's that are already fairly established and have active members, so... Doesn't sound like you're gonna get anywhere quickly unless you're willing to start small and work your way up. If that's the case, you can start with a group of friends or even random players who are new too and willing to learn together, build up your knowledge, experiences and ability as a group while working on your fc's rank and eventually look into getting a house and then the recruiting should come easier.

I guess a few things that you can consider though, that might help;

What kind of player are you? Casual or hardcore? Endgame oriented, or are you more of a crafter? I'm not sure exactly what your experiences with Destiny, I'm not familiar with that game but if there are elements there that you enjoyed that are similar to things in xiv, or how dedicated you were to certain things and how much time you spent on them, that might help you figure out what your overall playstyle is. Also, taking some time to learn the ropes, progress your character and open up some of the endgame areas and other things that are available post 50 will help you figure this out too.

Also what goals do you want to accomplish in-game. This probably ties in a lot with what kind of playstyle you have, but part of building a strong group is to know what your ultimate goal is and to build a community around you of people who share common goals and interests. Like do you want to establish yourself in endgame, build a good static and are you progression oriented.. or do you just enjoy helping others through low level or mid-core content and want to build an active group that is dedicated to doing so? Things like that. Take the time to plan out what you want your fc to accomplish aside from just being large and giving you plenty of people to play with, because chances are it's gonna be a very different experience from what you're used to.

Good luck.