I think your first step should be go to a comic shop and browse through some comics. Get a feel for what you like. For new comics I like going to the newsarama site, it gives great info and previews of upcoming comics.
Another option is to read older comics that are favorites to the industry. Some stories like DD Born Again, Batman Year One, Watchmen, V, Return of the DK are all popular time proven favorite storylines. If interested in some different stuff besides super hero I recommend Maus (buy the trades), Usagi Yojimbo and Bone. Again you can buy collected ed and trades for cheap these can give you an idea of what you like at cheap prices. Same goes for every new title, they all come in trades its a cheap way to jump on a series for a cheap price.
