First time doing anal

So i just got done doing anal for the first time and im very surprised. I was super against it cause the idea of a dick in my ass was a turn off. And my boyfriend begs and begs for it and always sticks his fingers in my butt while we have sex and on several occasions, bled with just one finger. But it didnt feel bad, barely hurt, just a little uncomfortable and didnt bleed. But is there anything i should know for prepping and after care? Thanks!