All SMS guides and stuff I can find for Any% and 120 as of May 15th 2021:

#Guides and Routes by @Milk and @Dutchj (Any% and 120 Shines): http://milk.dog/guide/

Milk and Dutchj made a Multi-Use Guide for all things SMS, so if you need something this should get you started. Here is also Dutchj's Sunshine Tutoring playlist: https://www.youtube.com/playlist?list=PL9x3FZgtou8Y4xudr-xIFVUeLK6KnRk8k

#120 Shines route by @SB_runs : https://docs.google.com/spreadsheets/d/1RYgVH24OCRzEurlxePwU7Ltt-mtNuSK5yHYcrjiRAKI

A modified and to my knowledge faster version of the Bramz route, made by SB. More recommended towards intermediate level than beginner.

#120 Shines routes (including Glitchless) by @Bramz : https://docs.google.com/spreadsheets/d/1sFo7cO9EQng9yR_DfTc6k_TcDmTJScbTgB1njL5RS5U

Most people talk about Bramz' route when talking about beginner 120 routes. This sheet even includes a Glitchless route if you wanna consider going without knowledge into a SMS 120 run for say a 602 Race. If you need a more outdated version from 2018 in a different style, I converted this into a presentation similar to the style of SMO All Moons routes: https://docs.google.com/presentation/d/1-54HGMZAA6cfDicNjZEDQrtI5yBn3ooY3MSJaiLGeFc I use slightly different descriptions for blue coins, in any case I can recommend watching the runs. Feel free to copy my presentation and edit it to suit your style if you want to take this as your baseline for your route.