This should help with the notes of the chords.
http://www.smithfowler.org/music/Chord_Formulas.htm
And this major scale box pattern helped me to find where to put my fingers on the bass fretboard - to make that chord.
Bass Patterns based upon the Major Scale box.
Major Scale Box.
Code:
G~~|---2---|-------|---3---|---4---| 1st string
D~~|---6---|-------|---7---|---8---|
A~~|---3---|---4---|-------|---5---|
E~~|-------|---R---|-------|---2---|4th string
The chord formula chart will tell you what notes make up a chord. The Major scale box lets you find those notes on your fretboard.
Want the Cmaj7 chord. Put the box's R over a C note on your fretboard and then sound the R-3-5-7 notes within the box. Yes one note at a time, we do not strum chords we play chords one note at a time. Want the Cm7 chord. It's spelling is R-b3-5-b7. Yep the chord formula chart told me that.
Now if you would prefer a chart for every type of chord check this out.
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I prefer to memorize one chart - The Major Scale Box - and then adjust it for what I need to make. Use which ever one you like best.
Looking at the box; where is the b3? The b3 is a flatted 3 and you flat a note by moving one fret toward the nut. If you had a #5 that is a sharped note and you get a sharped note by moving one fret toward the bridge.
The box can also be used for scales. The major pentatonic scale is R-2-3-5-6. The minor pentatonic is R-b3-4-5-b7.
Have fun.