Hey and welcome to the group. Glad you found your way here!
I don't really think there's a strong 'guild' culture in today's NWN. You'll find server-specific guilds if you explore specific persistent worlds or possibly a gaming group that will typically be online at the same time of the day/week, but I've not seen any 'guilds' for quite some time. I'd be interested in a Roleplay guild, for sure.
That said, there is still great gaming to be had and groups to join. I'd recommend you try some persistent worlds (http://www.nwnlist.com/ - click on NWN1 worlds) that cater to your play style (action, RP, etc...).
You can reach out to the DMs/admins of a server to start a regular gaming session. On Arenthyor, I do that quite a bit.
If you want to try to find players to participate in multiplayer in a module, advertising it here, or on some of the other frequent forums (GoG.com, the Facebook group, etc...) could be a place to get the word out.
