How much should be withheld from my weekly paycheck for me to recieve a nice refund?

I ve only been working since April 2019. I just noticed that nothing is really been taking out but I have no clue how taxes etc work but something looks off. I have 2 dependents. They are my children DOB: 4/21/18 and 03/06/19. I have attached info from my most recent pay stub. I am paid weekly and gross between... show more I ve only been working since April 2019. I just noticed that nothing is really been taking out but I have no clue how taxes etc work but something looks off. I have 2 dependents. They are my children DOB: 4/21/18 and 03/06/19. I have attached info from my most recent pay stub. I am paid weekly and gross between 315-400 a week.
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