The servo requires 5 or 6 volts at at least 1 ampere current (probably more if there is a significant load) while the actuator requires 12 V at 0.6 amps to deliver its rated force. If you want both to work at the rated torque or force then you need two different power supplies, plus a motor shield or motor driver board for the linear actuator. The Arduino should never be used to power a motor, but the pins can be used to control motor drivers.The actuator will probably work on 6 V, but it would deliver half the rated force or less. If that is OK you could use one 6V power supply rated at 2 amperes continuous current for both.For connecting servos and the Arduino see the attached diagram, drawn by another forum member. For connecting the actuator, refer to the documentation for the motor driver you choose. I use and prefer the boards from Pololu, who also provide excellent support for their products. This one will work for your actuator: http://www.pololu.com/product/2136 Be sure to connect the grounds of all power supplies and the Arduino together.