Hi there, I am expecting July and right now co...

Hi there, I am expecting July and right now contemplating whether to buy a breastpump and which one. I really would like to breastfeed and have heard that a breastpump can help express the milk faster, so enabling more milk flow etc. What are advantages/disadvantages of a breastpump? Should I go ahead and purchase? And which type? I would appreciate any comments on the subject as I am fairly naive about the whole process at the moment. Thanks in advance for your help