I am not sure if this is what you are looking for, but here goes.
Regarding seminars you could contact the following companies. They put on retirement plan seminars all around the country and are very good.
Corbel -
www.corbel.com PPD (owned by Corbel) - 303-759-1004
McKay Hochman -
www.mhco.com Universal Pensions - 800-346-3860
AS far as creating your own accounting system for use with your plan I would like to suggest that you strongly consider purchase a software package specifically designed for this. Yes, I know that they are expensive but they also have some benefits. These benefits include 1) complaince with changes in regualtions regarding testing, 2) access to Users group (a valuable source of ongoing information), 3)saving of time, etc. The drawbacks include 1) continuing outlay of cash, and 2) possible learning curve.
I believe that if you want to ensure that you are operating the plan correctly you should attend as many seminars as possible and look into purchasing a software package for the processing of the plan.