
First, welcome! 
1) I think Quicksand is by far and large the most popular and crowded place when it comes to the concentration of RPers. But I have also ran into RP in The Drowning Wench, and occasionally at the Carline Canopy.
There is also list of RP events that you can attend to find RPers!
http://ffxiv-roleplayers.com/forumdisplay.php?fid=20 - listing of RP events here on the RPC
http://balmungrpcalendar.tumblr.com/calendar - if you tumblr
2) You can join only one FC, but up to 8 LSs. Most people find an FC of like minded people and also join LSs to increase their network.
3) Making Connections folder is a good start to get yourself out there! An intro there also lets people know who and what you are about and what you might be looking for. Some people also post a profile in the Player Directory and create wiki profiles for their character. It helps people know who you or your characters are.
4) There are also a TON of RPers and FCs that do not advertise here. The Balmung RP community is bigger than the RPC. But I do think that even many of those that don't post in the RPC still know of this place or visit occasionally.
I am sure you will get more (and likely better) answers! Good luck!

1) I think Quicksand is by far and large the most popular and crowded place when it comes to the concentration of RPers. But I have also ran into RP in The Drowning Wench, and occasionally at the Carline Canopy.
There is also list of RP events that you can attend to find RPers!
http://ffxiv-roleplayers.com/forumdisplay.php?fid=20 - listing of RP events here on the RPC
http://balmungrpcalendar.tumblr.com/calendar - if you tumblr
2) You can join only one FC, but up to 8 LSs. Most people find an FC of like minded people and also join LSs to increase their network.
3) Making Connections folder is a good start to get yourself out there! An intro there also lets people know who and what you are about and what you might be looking for. Some people also post a profile in the Player Directory and create wiki profiles for their character. It helps people know who you or your characters are.
4) There are also a TON of RPers and FCs that do not advertise here. The Balmung RP community is bigger than the RPC. But I do think that even many of those that don't post in the RPC still know of this place or visit occasionally.
I am sure you will get more (and likely better) answers! Good luck!