Welcome to ClubSNAP..
You might want to start reading here to get the basics of Canon Flash photography:
Pay special attention to the different modes (ETTL, Manual Flash) and how to adjust flash power.
The 430EX is a hot shoe flash that requires contact to the camera. Alternatively, you can use your 430EX II as optical slave, triggered by camera flash. I would recommend paying a few Dollars and getting the wireless triggers that support ETTL and Manual Flash so that you can manage the flash power from the camera position. You will need a transmitter (put on the camera hot shoe) and a trigger (put underneath the flash). The radio signal will transmit the settings from either ETTL or Manual Flash).
Personally, I would recommend Godox here. The Transmitter has a nice display and you can use Canon flashes with Trigger or get the Godox flashes and use them directly.