Google is your friend.. thought if you are using your work/share PC, I would erase browser history.
Basics - (assuming your female partner is willing)
Don't emulate porn vids as the girls prepare overnight for the scene and are used to getting ass fucked by multiple large dicks.
Its dirty - always wear a condom, ask your partner to take a dump first, but anal enemas or douches are not necessary, unless you want raw sex and she likes the water play, you can buy them at hospital pharmacies.
Always use lube, more than straight sex
Start small - I insert a lubed pinky finger while going down on a lady, once you've penetrated to the second joint, you know you can work toys/more fingers in.
Try toys first - you can get butt plugs of different sizes, to get her adjusted to taking bigger objects
Once you can work three lubed fingers in, you can stick your dick in - take it slow, her sphincter will resist, so dun plunge in. Once you slowly insert all the way, wait a few min to let your partner get used to the feeling, then start slowly pump.
Always be ready to add lube, especially the first time. I know ladies who love anal sex, and just need some spit...
Be thoughtful - have towels and wet wipes at the ready to clean up the ensuring mess.
https://www.self.com/story/anal-sex-questions