Novice Core Programs

So i recently started a two day SS split and im doing squats and deadlifts.

On the rest days i do two kind of planks to strenghten my core.

I know the lifts on SS do that already.


But i have a pretty weak core. My mom punched me on the stomach the other day and i almost vomited.

So i need a core program for novice...

Can anyone helpe me with that?
Something i could do on my off days from lifting...

thanks in advance!