Hello MDISCUS, here are a couple of good books I would recomend to anybody interested in keeping discus: Back to Nature Guide to Discus by Dick Au and Success With Discus by Jim E. Quarles both are straight forward ....but first and foremost I will echo what you will read here on this and any forum and in any good book BUY ONLY QUAILTY DISCUS ! ! ! and buy in a group of at least 6 of the same size the "color/style" doesn't matter just get at least 6 try to find a local dealer with a good reputation so you can see first hand what you are buying and only buy "good discus" the books recomended go over "what a good discus is" there are online sellers but I would recomend buying from somebody local for your first few purchases ( yes once hooked you will make many "buys" ) check with members of your local fish club they can be very vauable sources of info and local dealers also be carefull with discus from your local fish store "some" (not all) usually don't do a good job with discus just be cautious and look for good quaility discus some local fish stores do a great job on buying and selling good quaility discus
GOOD LUCK and welcome to the wonderfull world of DISCUS the" King Of The Aquairum"