I really do not know.

you open up your preferred engine imagine a concept and then begin creating the concept in your preferred engine

What sort of horror game are you trying to make?

Maybe try copying your favourite game?

Just remember, though... Keep it small. This is a game jam, and you only have a short time to try and get a game together.

There are lots of engines out there to use, and lots of assets to help start you off.

If you need any help, ask. That's what jams should be for! :)

alright thank you!

No one does it better than Brackeys https://www.youtube.com/watch?v=IlKaB1etrik