This is a really easy beginners song that I used when I first started. Just keep 
back between the 4 and 2 frets using your ring and index fingers only.


e|----------------------------------------------|
B|----------------------------------------------|
G|----------------------------------------------|
D|----------2-----------------------------------|
A|-----2-4-----4-2------------------------------|
E|-0----------------4---------------------------|


Then play this:

e|----------------------------------------------|
B|----------------------------------------------|
G|----------2-----------------------------------|
D|------2-4---4-2-------------------------------|
A|-0---------------4----------------------------|
E|----------------------------------------------|


Finally this:

e|-5-4-3-2-0------------------------------------|
B|-5-4-3-2-0------------------------------------|
G|---------1------------------------------------|
D|----------------------------------------------|
A|----------------------------------------------|
E|----------------------------------------------|