The bible is the notebook used by all of the writers of any television show. Every single tv show (reality tv being the exception) has a bible - a blueprint of how the show works. It has detailed bios of every single character, their established relationships with other characters, plots that have been done, plots that are being produced, plots that could possibly be used in the future. It contains every single thing that a writer on that show would need in order to write an entire episode by themselves. In order to get one, you'd need to either be a writer on the show, or know somebody who has been a writer on the show.
Also, and I don't mean to be quarrelsome or angry, but shows like "The Simpsons" have dozens of writers working on each and every episode all of the time. Not just that, but this show, in particular, has been going without the help of yourself (again, no offense. it's just the way things are) for going on almost twenty years now. Lastly, you could not submit your episode without representation, and a good agent/lawyer at that. This is advice for everybody, not just yourself Zenmaster. The entire studio system is in place to keep outsiders out and insiders in. This is why people who you see making it had one, but usually both of the following going for them: they knew somebody with an in. Or, more rare, they are really fucking talented. The latter is the more rare of the two. Sad to say, but that's just how things are. The best thing that people can do, writers especially, is to win high-profile competitions or direct their own stuff to give them more "clout"/experience.