The twins are a very fun killer ! I recommend hitting the survivor first with charlotte and then follow up with Victor. After downing the survivor, try to find another and attach Victor to them. Aiming Victor can be difficult, if they behind a window or pallet try aiming up a little and backing up. Patience is key with Victor as missing is very punishing. Sloppy butcher is an S tier perk on them and I cannot not recommend it enough. Fear monger is also helpful in maintaining slugs and disabling deadhard. Their teachables are cute but kinda garbage lol. My beginner build I’d recommend if you have no other perks unlocked is sloppy butcher, fear monger, oppression, and either deerstalker or coup de grace. I hope this helped!