What should you do on 26 April
First, connect all three servos to the Arduino and test whether they work using WASD and IJKL controls.
Once you have tested them and confirmed they are working, you can start the mechanical part by connecting all the motors to the robot.
After that is completed, build the pickup mechanism and attach the servos to the gripper, lift, and rotate mechanism.
This is the wiring diagram for you to connect the servos
For the 3 servos, you can take the positive and negative supply from the buck converter output, and the + / - can be shared.
And connect the signal pin from the Arduino to the servo.
This is an example of a pickup mechanism that you need to build :
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ill build the whole arm mechanism with lego