Just tell me one thing does it work just th same as warhammer fantasy but with a few tweaks?
Not even remotely. WotR is a much more streamlined ruleset designed for bigger armies and faster play. Some of the biggest differences are
The basic operating unit in the game is not the individual miniature but the company (one movement tray of 8 infantry or 2 cavalry). So instead of having, say, a regiment with 25 individual miniatures like in WFB, you have a formation of 6 companies, each company is a separate "thing" with 8 guys on it but the 8 guys always act together.
Turns are not "I go, You go" like in WFB. Instead both sides will move then both sides will shoot and so on. This has the big advantage of reducing the amount of time you have to wait for your opponent to finish his turn so you are much more actively involved in the game. It also creates more strategic elements. Oh, and WOW did it take us a while to get used to that. I can't tell you how many times we played in the beginning and would have someone move then shoot then charge then we realize that the enemy was supposed to have already moved and shot as well.
Attacks are all resolved on a single roll of (many, many) dice. Instead of WFB where you roll to hit, then you roll to wound, then the enemy rolls armor saves then he rolls ward saves. Most of the time in WOTR a fight can be resolved with a single roll of a handful of dice. (I think my record is 42 dice in one attack.)
Those are a few of the biggest differences, there are many more.