Tips for first time modding:
Setup
This is all stuff you can do way before the game starts - do so, otherwise you'll be very frantic.
Get your spreadsheet going on Google Drive. Definitely use Google Drive - it has a memory, so if you do something wrong you can restore your sheet, even days later.
You should have a tab with Role PMs (or a separate Google Document, whichever you'd prefer), a tab with Night Actions, a tab for ITAs (if you're running any), a tab with a live player list and an Master Sheet tab. There are other tabs you can have that you may find you want, but those are core ones you
definitely need.
Night Action Tab
Make it look something like this (this is what I had for my first MM). This is going to be your baby the entire game.
Note certain things:
The top line is order of actions, from left to right. Order of actions makes a difference, obviously. There isn't, afaik, a completely 100% standard way of doing it, but "anything that affects other peoples actions" going first and then everything else is really fine. Also maybe ask yourself what you would do if a RBer blocked a RBer, that sometimes trips up new mods.
The roles are listed in that order from the top to the bottom, so you work your way down. I yellow in everything that I've processed and orange anything that failed (a RBer RBing someone who had an action, or something). Colours may not be your thing, but whatever works.
Remind me once Anniversary is over to show you that NA spreadsheet because I set it up a different way and you may prefer that.
Master Sheet
When I say Master Sheet, I mean a sheet that at a quick glance tells you everything about the state of the day as it currently is.
So a live player list, with everyones affiliation and a one or two word description of their role ("roleblocker" "even seer" "JOAT", etc).
Then, at the top somewhere, anything that isn't a night action but has an effect. Double Voters, Vote Buyers, People who are Day Angeled, People with Extra Lives, People who can't be killed for X Y Z reason.
Then have another little bit for "roles that require a PM response to their night action". Most common are: Seers, Watchers, Trackers, Mechanic Seers. Just so you don't forget to send them, make sure you check them off every morning and delete when they're dead.
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If you've got them set up before your game even fires, you'll be in good stead.