I've posted this in the past and find it helpful for me. You can write your own scales. The notes are
A, A#/Bb, B, C, C#/Db, D, D#/Eb, E, F, F#/Gb, G, G#/Ab for 12 tones. Each set between the commas is a half step. For a Major scale pick your root note then go whole (2- 1/2 steps up), whole, half, whole, whole, whole, finally up half.
Your scale would be:
G, A, B, C, D, E, F#, G
The Chords in your series for a G Major scale would be
I- GMaj, II- Amin, III- Bmin, IV- CMaj, V- DMaj, VI (relative minor)- Emin, VII- F#min, VIII- G
The Gmaj scale and the Emin scale are the same. You renumber the chords starting at I with Emin for the Emin chords for the progressions I, IV, V for example.
The sheet I've attached also has a staff and the positions of the open notes of the 4 courses from the mandolin noted on it(1' = open G, 2'= open D, 3'=open A, 4'= open E).
You also have a key of the fingerboard showing each note on each string at each fret. With standard tuning from going from open to fret 7 takes you up to the next higher open string (e.g., fret 7 on the G course = the same pitch and note as open on the D course).
There's also space on the sheet to write your own inversions for the Chords in the Key with extra space on the back. A good chord book will teach you how to construct your own chord inversions (hint it's based on the notes in the scales).
If you can master this stuff, you'll be well ahead of me.
While I see a great larger world open to you musically by learning standard notation, tab can be a fun way to learn a tune pretty fast. I hate to think of notation/tab as an either or thing. They can both be tools to making music. Tab written for mandolin is mandolin specific. You can't use guitar tab on a mandolin without some serious translating (probably back to notation then to mando tab!). Once you know the notes on a standard notation staff any music written in then mandolins range can become mandolin music.
I hope this helps and I hope if I made any errors someone points 'em out quick.
There are two things to aim at in life: first, to get what you want; and, after that, to enjoy it. Only the wisest of mankind achieve the second. Logan Pearsall Smith, 1865 - 1946
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