At this risk of sounding like I'm just trying to sell our wares: Our firm wrote a text on correction programs for ERISApedia that can be purchased. If interested, go to ERISApedia.com. We also did a video certification program for NIPA (nipa.org).
Having said that, I really recommend that you at least associate with someone who knows how to do plan correction work on your first venture into VCP-land. There are a lot of arcane rules about the filing, as well as things that people have learned over time that are good ideas or bad ideas for ways to approach the correction programs. Again, if you think that I am making this recommendation just to get business, contact me, and I'll refer you to another law firm for assistance. I'd rather send you in the right direction.
Last but not least, kudos to Justanotheradmin for suggesting that the plan be fixed prospectively. Stopping the bleeding is one of the "best practices" things that people who do a lot of correction work always preach.
Good luck!