Finally decided to post my guide here. Doubt its the best and I'm sure someone will make a better one once GMS2 is released, but I haven't seen a video guide that goes over all this information yet. I did make a few mistakes but its good enough.
Somethings I could have explained better were note lengths and character limits.
Note length explanation:
1 = whole note
2 = half note
4 = quarter note
Etc.
So two half notes equals a whole note, four quarter notes is a whole note, sixteen 32nd notes is a half note. Just a little bit of basic math.
Character limits:
MapleStory 2 has 3 different music sheets, one for 3000 characters, one for 5000, and one for 10,000. The 10k sheet is locked by default, you will need to unlock it (which can be done by just playing music and leveling up your mastery). 3ML will show you the amount of characters used in a track at the bottom.
Midi used in this video can be found here:
https://musescore.com/scorpio5/scores/5043474
I've also posted the final product here:
