You never said what species you are trying to fish for.. Yes there are different flies for each species there is no magic bullet. but a simple clouser in white or chartreuse will get you started for at least small and largemouth bass and smaller clousers could also be used for panfish..
Not endorsing Orvis .. but give this link a try
http://www.orvis.com/bass-pike-panfi...Kq9hoCmd7w_wcB