Welcome to Wyrmrest Accord! I hope you enjoy your time here.
There’s a couple ways to look for a RP guild, and my biggest suggestion is probably going to be checking out the Wyrmrest Community Project. It functions as a hub of sorts for RP on the server, and it’s probably going to be your best avenue towards finding a small, healthy RP guild.
You can also try checking out the Stormwind Farmer’s Market next month as there might be guilds attending or hosting a stall. I know Duskwood is also an active RP hub for Alliance side late-night EST, and as for finding some more information you can check this forum thread, which is usually pretty reliably updated as far as I know with regard to when it is active out in Duskwood. You can potentially find a guild out there too.