configuring irony

[Sanjeev Sariya]

Hi Emacs Users,

Apologies if this a naive query. I'm new to emacs world, and have been trying 
to learn how to set up config in .emacs/init.el file for irony package.
I've installed/downloaded irony, company-irony, added their path to my .emacs 
file, yet they don't work.

https://github.com/Sarcasm/irony-mode

 My .emacs file look like:

(add-to-list  'load-path 
"/Users/sariyasanjeev/.emacs.d/elpa/irony-20150831.144/")
(load "irony.el")
(require 'irony)
(add-hook 'c++-mode-hook 'irony-mode)
(add-hook 'c-mode-hook 'irony-mode)
(add-hook 'objc-mode-hook 'irony-mode)

(add-to-list 'load-path 
"/Users/sariyasanjeev/.emacs.d/elpa/company-irony-20150810.239/")
(eval-after-load 'company
    '(add-to-list 'company-backends 'company-irony)) 

How do I enable these?  Emacs -version 24.5.1 GNU, OSX, 10.9
Please help me.

Best,
Sanjeev