Powering 2 DC motors with a 9V battery and transistors

hi, have arduino ethernet , need power 2 dc motors. have 2 transistors can use 9v battery.

the motors using these:

https://catalog.precisionmicrodrives.com/order-parts/product/308-102-8mm-vibration-motor-15mm-type

i going using pwm control speed, wondering how work out current/voltage putting out motors avoid going above , below rated values.

i assume differs depending on how wired up, want use separate output each motor using 2 transistors (1 each), same battery supplying them.

thanks in advance help!

add 27-33 ohm 1w resistor every motor, consume excess voltage.

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