This is for newer players or people wanting to create a new character but unsure what race to use. I remember having alot of trouble selecting my race in the beginning.
So in world of warcraft there are several races, each with their own characteristics. To a new player it my appear difficult to select a just one race. So this guide is here to point you in the right direction. So the first step is deciding yourrace is deciding your faction.The majority of races, besides pandaren, are given a set faction. Each character can talk to those inside their faction and only those inside their faction. So if your friends are in the alliance, then you probbly go with an alliance race.
After you narrow down your choices by slecting a faction, you can limit them even more by selcting what you want your class to be. Some classes can be learned by all races like warriors or mages but others are more limited like druid or shamen. fter the class is selected ten look at your options. Some times it is just a matter of which race looks cosmtically the best to you but a select few races have a racial advantage in a class.
An example is if you choose horde and want to be hunter, it leaves you with many choices. But, trolls recieve a bonus when they bows or throwing weapons, which are hunter's weapons

so this was just a quick guide for selecting your race.