"rules" for establishing the u. s senate are found in :

"Rules" for establishing the U.S senate are found in Quorum in Article I, section 5 of the constitution.

Explanation:

The Senate floor under the legislative process is structured through a set of ground rules set by the Office of Parliamentarian. "Rules" for establishing the U.S senate are found in Quorum in Article I, section 5 of the constitution.

There is a particular balance between the rights guaranteed to senators with the senate rules, and also for the senators to apply the rights to action.

Every rule that is for the established  U.S senate are noticed in "Standing Rules of the Senate" in rule VI and is made sure by the senate floor that each rule is established by the Senates.