this should be the first song you ever learn. It's just A,D and E:

Verse 1:

3||A          |A             |A               |
4||Far have i |travelled and |much have i seen|

3||D             |D              |A          |A    |
4||Dark, distant |mountains with |valleys of |green|

3||A            |A           |A           |A   |
4||Past painted |deserts the |sunset's on |fire|

3||      |D          |D           |E       |A  A  A|
4||As he |carries me |home to the |Mull of |Kintyre|

Chorus:

3||   A   A   A  |A  A  A  |D    D   D   |D  D    D   .|
4|| 1.Mull of kin|tyre, oh |mist rolling |in from the  |
    2.Sea  my de-|sire  is |al--ways to  |be here,oh  .|

3||   E   E   E  |A   A A |D D D |E E E|
4||   Mull of kin|tyre----|------|-----|