Welcome to WoW! I hope you enjoy Wyrmrest Accord!
This is a perfectly fine place to post looking for a guild, but while there are plenty of guilds that check this forum, there are plenty more on the server that don’t. If you’re looking for a Horde guild in particular, you may be interested in the Horde Guild Faire and its associated Discord server, which you can find by visiting their site here: https://hordeguildfaire.carrd.co.
If you’d be interested in an Alliance guild, and/or in a place to network with other WrA RPers and see a calendar of WrA-specific events, I recommend the Wyrmrest Community Project, who have a link to their Discord server in their forum thread here: Wyrmrest Community Project.