You can kind of define your own “entry level”. You can join a casual guild that hosts some Normal raids or you can go straight to a Heroic guild. I’ve joined a lot of Heroic Guild runs in LFG for fun and they’re all pretty chill and understanding.
There’s also a Discord called Perky Pugs that runs Normal/Heroic CN Pugs that only have an ilvl requirement, that could be a good place to start before you decide if guild raiding is something you really want to do.