what are some tips and places to start for couples just discovering their kinkier sides?

my boyfriend and I have been together for 4 years and are only now discovering how deeply I love to be dominated

and how much he loves to dominate.

we've discussed a lot of fantasies already. and I've submitted to being his entirely(an incredibly hot thing to say)

I was wondering what are some getting started tips for us. things to be on the look out for and be aware of.

things you guys wished you knew earlier.that sort of stuff