Hi Guys,I Have some questions about maping The SDK for CoF because i am a noob making maps

:
1. How I Make Music Background?(ex: you are walking on a corridor and a creepy music starts to play)
2. How I Change the Introductions?
3. How I Make Circles Things? For Example This

4. How I Make Jumpscares? (ex: the one on the first map)
5.How I Make Wad Files?
Okay,that's all for now

. If Someone can Help Me Answering this questions i will appreciate it

.