The correct term is beat matching or disc jockeying as audio mixing is classed as using recordings to create a mix which is then interpreted as a song. DJ's get all the attention for something a machine can do... however the dj's are the creation behind that, if you dont have the creation side of it learning how to bpm match is pretty pointless. The DJ's I know and work with all say to start on vinyl and then work your way to CDJ's as mike mentioned above. Also learn about what your mixer does and how you can work that to imrpove your set's once you get going.