If you live in the UK, I would first write down the idea in depth, put it in an envelope, and post it to yourself through the Royal Mail. When youreceive the letter do not open it and keep somewhere safe. This is know legal proof that this idea was yours, and also legal proof of the date that you had this idea. You would know own the intellectual property rights to your idea and have proof with the royal mail date stamped unopened envelope with your idea inside.
How you translate your idea into profits depends on what your idea is but at least no-one can steal the idea from you and claim it as their own.
I have no idea YOU KNOW WHAT THIS WEBSITE IS USELESS
One can either contact Ultra Computers via Facebook, Twitter, or any other possible social media channel. The classical way, so to speak, to contact the Ultra Computers would be to pick up a telephone and call them.
One could contact IBM itself to place a bulk order of computers. One could also contact a store selling these computers to consumers or private companies.
Data
While I have no idea what a "delta person" is, I would expect them to use computers simply because just about anybody uses computers nowadays.
Contact the university
I think I have no idea about it
Contact https://www.cia.gov/ It is easiest to write them a letter (they haven't really gotten into computers yet).
Vital to the computers registry
Homer Simpson created computers
so you know about different computers
so you will have an idea when you business is hard