New, need advice on cuckolding/ swinging 27m/28f

Hi, me and my girlfriend have talked about trying out new experiences. We have spoken about threesomes before and are both open to trying to step outside of our comfort zone. We’re quite excited for it and have said we would be down for couple swaps/ threesomes both with guys and girls. I was hoping for a bit of advice on how to start but also how to manage cuckolding/ swinging. We’re in a stable, long term relationship and want to have fun but keep the relationship solid. Anyone with expertise please feel free to dm. Thanks :)