Is the Warfare Online game free?
Yes. 
Where is the download link for the Warfare Online client installer?
https://www.warfareonline.net/downloads/
What is the system requirement for the game to work?
What are the roles available and the classes that I can play?
Leveling guide for new Level cap 95-96
A beginner's guide to Warfare Online - Ak'Kan (Level 1-95)
Is there a walk-through with regards to in game questing?
https://forum.warfareonline.net/c/guides
Is there a list of top weapon and armor status?
https://forum.warfareonline.net/c/item-stats
Account related
What the difference between a Web account and In-game account?
Web account is your login in order to access the website / forum. It is basically your registered email. In-game account is your login ID in the Warfare Online game which you created in your Web account. A web account can managed up to 5 game accounts.
I do not have a web account but game account was registered before year 2016
You may just register a new web account with desired email address and then merge your game account to your new web account.
How can I register for a gaming account?
How to register a Web Account and Create a Game Account
How can I add my old account to merge it with my other in game accounts?
How to merge your existing Game Accounts
How can I retrieve my in game vault password?
How to retrieve Dragon Vault Pin
How to change my in-game account password?
How to change your in-game account password
How to retrieve my in-game account password?
How to retrieve your in-game account password