If you will be claimed as a dependent then YOU cannot have dependents of your own so on the W-4 just click the single option and you are done with that form. Now ... are you really going to be a qualifying dependent ? If you are not in college under the age of 24 then if you make more than $4300 you cannot be claimed as a dependent. IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent https://ttlc.intuit.com/questions/3113432-who-can-i-claim-as-my-dependent
