This is a digest of a Ben Burns NRB video which was linked from The Casoursel Scripts document.
Drukeness and Poisoning are mandatory.
There must be some level of Outsider Manipulation.
Hard confirmations are bad.
Demons must have the ability to hide.
At least 13 townsfolk need to be on your script, with very few exceptions.
Utilize Standard Amy Order.
Spirit of Ivory is not a Script Fixer.
Minimize Jinxes.
As a corollary to #5, you need at least 4 outsiders and 4 minions on your script.
Minions (And to a lesser extent, Outsiders) should never be guaranteed to be in play.
Avoid redundant design.
Include character pairs.
Reddit Link: Reddit | r/BloodOnTheClocktower | Guidelines for Script Building Video link: NRB Halloween Competition - Design a Script for Blood on the Clocktower
Figure out the basics
Include misinformation
Conceal the outsider count
Conceal which Demon is in play
Avoid good characters who are too easy to confirm
Give the good team reasons to be secretive
Give the evil team an escape hatch
Aim for similar minion "loudness"
Consider using Fabled
Consider starting Teensy
Further resources
Direct link: Beginner's Guide to Blood on the Clocktower Custom Scripts
Direct link: BotC Script Building Guide
by Ken Cheng
Hosted online by baru_monkey / Andy L. (Discord)
This is a script which permits 3 people to play BOTC with one Storyteller.
Direct link: Script Building by the Ravenswood Bluff Fan Site