Follow these step by step methods to upload your file and get link of that file
a) Go to www.google.com/drive and Login with your google account.
b) Upload your file into your GoogleDrive Window.
c) Afer upload process completion it looks like
d) Write Click on your uploaded document, go to share and then click Share .
d) It looks like below
e) Click on Advanced then you will get
f) Click on Change … and then Change Link Sharing to Any one with the link.
g) Click Save button and Now you can simply copy that link to share.