24[M4A] Leeds, First time going to Pandora Club – need some advice!

I’m thinking about going to Pandora Club for the first time, but I’ve never been to a swingers club before, so I’m feeling a bit nervous.
I was hoping some experienced people could answer a few questions:
What’s the general atmosphere like?
Do I need to register in advance or can I just turn up?
What’s the dress code?
Are there any rules or etiquette I should know before going?
Is it beginner-friendly for someone coming alone?