Hello!

Core workouts can be done along with your strength routine. Like any other muscle you want to give your core muscles enough rest, so every other day (e.g Monday wednesday friday) is usually good.

that being said, core workouts come in many shapes and sizes. Where the harder core stuff (such as plank, back extensions etc) should be done every other day, some relatively easier stuff (kiegel, simple pelvic floor exercises) can be done every day.

I recommend working with a trainer to learn the proper technique and the exercises that are appropriate for your "Core needs". We all have different weaknesses and postural issues that need to be addressed for an effective core workout.

Have fun
Han