Here is a regimen I would reccomend. I don't know what part of the country you are in, but first, find a beer-shop that has a really large selection. Spend some time in there just looking around. Then, start with something that is not too far from what you are currently drinking. Say a pilsener. This is a type of beer originating in Europe. Its also called a pils. Top shelf her eis a brand named Pilsen Urquell - most excellent. But there are also others. Anything from Czech Republic will be good. Thats where pilsener been started, in the town of Pilsen. You are going to be tasting some really clean, fresh tasting beers. Try these for a while and find some you like. Another most excellent beer is a Fischer from the Alsace Lorraine area of France.(its made by a German family). IN the German area, Becks is good. But you can find one you like there. Most Mexican beer is basically German formulation and brewing. Germans started been in Mexico and central/South America. Notice I have not mentioned Heineken? I refuse to drink it; yes I know its famous. But its also full of chemicals. Heineken Corp pays Germany big $$$ every year for a wavier of the Reichs Brewing law to allow import of Heineken into Germany.
Next...we move into some of the fuller flavored American micros. CHEERS!