These are my seven main fingerboard shapes for learning the major scale modes
The way to start is by modulation from mixolydian to dorian, back to mixolydian then to major on each root note. Play these scales at positions from four up to eleven, to cover the eight root notes 'A' to 'E'. Learn the other modes and keys progressively.

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1 Ionian
The "Major" Scale

2 Dorian
Intervals are the same going up or down
1 2 b3 4 5 6 b7

3 Phrygian
The "Spanish" sounding scale
1 b2 b3 4 5 b6 b7

4 Lydian
Major Sharp Four
1 2 3 #4 5 6 7

5 Mixolydian
The "Dominant" scale
1 2 3 4 5 6 b7

6 Aeolian
The "Natural Minor"
1 2 b3 4 5 b6 b7

7 Locrian
Used with a m7b5 chord
1 b2 b3 4 b5 b6 b7

Click the link for a 12 bar blues exercise with MIDI backing track
> Ex. #1 >>>>> blues_0.html
> Ex. #5 >>>>> blues_5.html