What are you trying to do,are you setting up a system for home theater or stereo or are you just trying to learn about equipment,im not sure what your trying to do but ill try & answer your questions.
In order to get "good" at listening to quality equipment you first need to find out what your ears percieve as sounding good & what type of sound that you like,good equipment to one person is another persons garbage.
After you learn what type of sound you like the only real way to get good at knowing what equipment will sound good in your home is to try different gear in your own home,you can visit different dealer showrooms till the cows come home,listening to tons of different equipment but without having tried different types of speakers & equipment in your house you'll have no reference point to determine what will work in your house.
Every dealer showroom will sound different than your room in your house,what sounded great in a showroom may end up sounding horrible in your home,there is no substitute for hands on experience.
With that being said,if your goal is to set up a good sounding system for as little cash as possible your best bet is to post another thread describing your goals,tastes in music & movies,room size & budget,system size, 2.1/3.1/5.1/7.1 ect,then try to go & hear the speakers & gear that people will reccomend.