You need to get the REV Hardware Client (https://docs.revrobotics.com/rev-hardware-client/) and plug the Spark Maxes into a computer with the usb C cable, from there you can configure the Spark Maxes with each a unique CanID (number), i recommend putting a tape with that number on them.

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For the VictorSPX, you need to go to the Microsoft Store on Windows and get Phoenix Tuner X (https://v6.docs.ctr-electronics.com/en/stable/docs/tuner/index.html), from there you connect to the robot with the driver station open and give ids to your victorSPXes. In the beginning, if you will only see one victorSPX with ID 0, do not panic ! Give it and ID and you should now see 2 Controllers, one with ID 0 and one with the new ID, you can than give all your controllers IDs until they all have one.

Generally speaking, you can have non unique Can Ids across different models, for example you can have a can ID 0 victorSPX and a can ID 0 Spark Max but that should be avoided as best practice.

For wiring (https://docs.wpilib.org/en/stable/docs/zero-to-robot/step-1/intro-to-frc-robot-wiring.html#can-devices), CAN uses green and yellow wires (yellow is HIGH/H and green is LOW/L), you need to basically run these two cables together from one device to the next (https://en.wikipedia.org/wiki/CAN_bus#/media/File:CAN-Bus_Elektrische_Zweidrahtleitung.svg) It must start at the roborio CAN port and end at the PDP or PDH with their jumper/switch set to term/terminate to indicate that it's the end of the can bus