Join Calm Keystones, as Bukachu said
Also join Scared of Dungeons
and Fail Train, who aim to do a beginners’ raid at least once a week
Don’t expect 24/7 groups from any of them, but ask around, and people should point you in the right direction. 
Longer term, I think you probably will be better off looking for a guild, but this might get you into the culture.
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