The Supreme Count does not make law. They let it stand, strike it down, or send it back to be rewritten.
When a law is enacted, and someone runs afoul of it. The person is put on trial. When the Loser still wants to fight*, the case is Appealed to a higher court. On each step the Loser may want to continue, until the case finally reaches the level of the Supreme Court.
IF the Supreme Court is interested in the case (that it has a Constitutional Basis) the court MAY accept it for Argument.
The parties attorneys may then literally Argue the Case, making points relative to the Constitutional issues. NO Evidence is presented, just words. Special attorneys then debate the constitutional application of the disputed Law.
After hearing both side the Jurists then discuss the merits of the arguments. After months of internal "arguments" they take a vote.
One of the members then writes a dissertation recapping the merits of the winning side, and a lessor member writes the recap of the losing side.
Not the basic issue is was the LAW meeting the limitations of the Constitution or not. If the law does not it is invalid, and the Legislature must either rewrite or drop it. Otherwise the Supreme Court may just return the issue to the lower court to retry, or let the law stand.
The Supreme Court does not Make Law. That is the job of a Legislature.
* There must be something WRONG with the law or the way it was used, not just bad feelings.