for the drive use the drills

the actuator i posted was only to show what is usually used in this hobby, yes foir a lifter 40kg is fine but if you wish to build other robots like many you may make them from older robots, so if you got one i suggested then you have more options in the fiuture

no it wont have its own battery pack i think it is better to get one like this as you are paying for a battery that might not be suitable etc