Verse/Intro/Chorus: || Am7 | D7 C ||

Long Jam: || Am7 | D ||

        Am7                 D7         C
e|-------------------------------------------|
B|---------------55---5---7-x-7-x-7--5-x-5-x-|
G|-5-7-x-7-x-5h7-55-7-5-7-7-x-7-x-7--5-x-5-x-|
D|-5-7-x-7-x-5h7----7---7--------------------|
A|-------------------------------------------|
E|-------------------------------------------|

If you wanna improvise in the long jam,
I would recommend a scale such as the Dorian scale in Am - It suits the Am7 and D chord 
It has all the important tones that Am7 and D has.
- A B C D E F# G A -
e|-------------------------------5-7-8---|
B|-------------------------5-7-8---------|
G|-------------------4-5-7---------------|
D|-------------4-5-7---------------------|
A|---------5-7---------------------------|
E|---5-7-8-------------------------------|