There's no official guide as of yet. However, I've been meaning to return to All-Nighter at some point to get it playable on other platforms, among other things. I'll make a note to look at putting together a full guide for the game when I get to it!
Okay, heres the exact route i took (mind you that im not sure all points matter, so ill mark them with an *; but i still took this exact route so here it is):
1) 'I didn't do anything, honest!'
2) 'Forget about it'
3) 'Leave it up to Clark'
4) 'Ethan and Jae' *
5) 'Jae' *
6) 'Ghost stories are fun'
7) 'Tell Omar to stop'
8) 'Ask Carlos for help' *
9) 'Tell him off'
10) 'Get down from there!'
11) 'Wait with Mr. Clark' *
12) 'Biographies'
13) 'Help Randall with his box'
14) 'Tell him off'
15) 'I agree with Mr. Clark'
16) 'Break it up'
17) 'Head back to class'
18) 'Grab a drink'
19) 'Root Beer' *
20) 'Head back to Mr. Clark's classroom'
now you have to search up the school. (again i dont think the order matters but hey):
1) Side hallway (untie)
2) Gym (untie)
3) Library (untie)
4) A/V room (untie)
5) Classroom 208 (untie)
6) Cafeteria (untie)
7) Principal's office (untie)
(maybe search the bathrooms, staff room, other classroom or something)*
Now this should put you on the good ending well...ending. Here i dont think it matters much, but i went straight for Randall (this also gets you the Photographic Memory achievement), and i got that ghost in them purple clothes. From here its really up to you what you pick from the ghost, but make sure to not pick 'I think I'll pass', because if you do, you wont get the epilogue. Hope this helps! :D