If a band is good or not is not determined by how big it is.

Give some examples of bands you like and the recommendations will come pouring down like rain. In the meantime you should listen to some Iron Maiden the best metal act in the world.

Start out with "number of the beast" great album to get you hooked, then you can keep going with "piece of mind" "powerslave" "seventh son of a seventh son" if you still like all of it skip up to "brave new world" and "dance of death" when you have listened through all of this you can just get the remaining albums.