Limit entity reference choice

Hi Drupallers,

I'm not sure if this is the right place to ask for support but I'll give it a go anyhow.
Here's what I want to accomplish but I'm not sure how to go about:

I'm trying to create an entity that is linked with 5 other entities from a different type and I'm thinking that entity reference might be the ultimate solution for this
All these entities should also be connected to each other but to NO other entities.
The user would then view either let's say entity 1 with the other 5 combined in a certain display but if he would click on a link of one of the other entities he would see all the connected entities again but in a different display.
Also, when a entity is created, it should automatically create all the other 5 entities as well. Can that be done?
If so, then there would not be a view for me to allow a user to select from it. It would go automatically and there could be no error by assigning a not related entity to the created entity.
If not, I was thinking that I could allow references to be chosen from a view.

I hope you understand what I want to do and if you have suggestions, links, or ideas, please let me know.

Best,
BassPlaya