As someone who has not (yet) read the Silmarillion, what are the three pieces of good?
If you have trouble getting into it when you do read it, consider an audio book. Hearing the names and places instead of trying to figure them out makes it a bit easier to pay attention to the actual story.
There is a podcast called LotR lore cast which goes through the whole story and breaks it down. It is really helpful in keeping track of everything.