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My understanding is that spi communications can only send information byte by byte, so am i supposed to convert my string into a byte format before putting that into the spdr variable so that it can be sent. The slave device's pins are connected to the same pins on the master device. I have an arduino uno acting as a master with 3 arduino nano's acting as a slaves.

A spi can have only one master and can have multiple slaves.

The following picture shows you the wiring. Master unit sends hello world data to slave unit. The following picture shows you the wiring. Spi.begin() − initializes the spi bus by setting sck, mosi, and ss to outputs, pulling sck and mosi low, and ss high.