Let’s focus on alternating our bass line on the lowest strings. Use the metronome and play a quarter note one note on each beat. Count aloud as you play 1-2-3-4.

   p p p p   p p p p   p p p p   p p p p 
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D-----------------------------------------
A----2---2-----2---2-----2---2-----2---2--
E--0---0-----0---0-----0---0-----0---0----
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Try different combinations.
p p p p p p p p p p p p p p p p
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D-----------------------------------------
A------2---------2---------2---------2----
E--0-0---0---0-0---0---0-0---0---0-0---0--
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
   p p p p   p p p p   p p p p   p p p p 
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D-----------------------------------------
A--------2---------2---------2---------2--
E--0-0-0-----0-0-0-----0-0-0-----0-0-0----
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Now try the same exercises on the A and D strings. Focus on rhythm and picking the notes cleanly.
p p p p p p p p p p p p p p p p
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D----2---2-----2---2-----2---2-----2---2--
A--0---0-----0---0-----0---0-----0---0----
E-----------------------------------------
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Try the other combinations as well.
p p p p p p p p p p p p p p p p
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D------2---------2---------2---------2----
A--0-0---0---0-0---0---0-0---0---0-0---0--
E-----------------------------------------
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
   p p p p   p p p p   p p p p   p p p p 
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D---------2---------2---------2--------2--
A--0-0-0-----0-0-0-----0-0-0-----0-0-0----
E-----------------------------------------
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Now we need to work on string skipping with your thumb. 
p p p p p p p p p p p p p p p p
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D----0---0-----0---0-----0---0-----0---0--
A-----------------------------------------
E--3---3-----3---3-----3---3-----3---3----
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Now we will mix in the A string as well.
p p p p p p p p p p p p p p p p
E-----------------------------------------
B-----------------------------------------
G-----------------------------------------
D----0---0-----0---0-----0---0-----0---0--
A------2---------2---------2---------2----
E--3---------3---------3---------3--------
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

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AE------------------------------------B------------------------------------G--------------1-2--2-1--------------D--------0-2-4----------4-2-0--------A--0-2-4----------------------4-2-0--E------------------------------------BE------------------------------------B------------------------------------G------------1-3-4--4-3-1------------D------1-2-4--------------4-2-1------A--2-4--------------------------4-2--E------------------------------------CE------------------------------------B--------------0-1--1-0--------------G----------0-2----------2-0----------D----0-2-3------------------3-2-0----A--3------------------------------3--E------------------------------------DE------------------------------------B--------------2-3--3-2--------------G--------0-2-4----------4-2-0--------D--0-2-4----------------------4-2-0--A------------------------------------E------------------------------------EE----------------0--0----------------B----------0-2-4------4-2-0----------G------1-2------------------2-1------D--2-4--------------------------4-2--A------------------------------------E------------------------------------FE--------------0-1--1-0--------------B----------1-3----------3-1----------G----0-2-3------------------3-2-0----D--3------------------------------3--A------------------------------------E------------------------------------GE------------------------------------B------------------------------------G----------------0--0----------------D----------0-2-4------4-2-0----------A----0-2-3------------------3-2-0----E--3------------------------------3--