Preparing two year old for new baby

Any advice? I’m due in three weeks or less (or more if baby is late)

We’ve been talking about it bought books but what else should we do beforehand or once baby is here ??

He’s so possessive of my belly no one can touch me he gets mad if my stomach shows. I’m nervous he’s going to either be possessive of me or baby or both 😮 how do I prevent this ?? He refers to my body as his ... so I’m worried about BF he’s also started hitting anyone who touches me 🤦🏽‍♀️