I have some questions
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The term "Pullets" refers to gender, it means a female under a year old. Most people advertise chickens as "Buff Orp Pullets" or something like that, so they would be Female Buff Orps less than a year old :3 do you have any other questions or need clarifications?
x 2, though for clarification are you using "kind" to refer to breed or another characteristic such as personality, etc?
ETA - if you already have chicks and are not sure of the breed we may be able to help you if you post photos of them.
Edited by Ol Grey Mare - 4/20/16 at 8:14am
That would depend on where you purchase them -- if you source from a hatchery, retail store or reputable private seller they are generally going to be labeled as "XXXXX (breed) pullets". The hatchery sites and many stores will also have brief breed descriptions, photos, etc that you can see to go along with the names of the breeds. If they happen to be in the "mixed/assorted pullets, brown layer pullets, etc" bins or sold as a "surprise package, mixed x package" then it is a matter of familiarizing yourself with breed characteristics so that you can start identifying various breeds by sight yourself. This self-education is also important when dealing with private sellers who may either a)not know what they have or b) wish to misrepresent what they have -- being able to identify birds can save you a lot of heartache and hassle.