Self employed

The person telling you everything is a "write off" may be exaggerating somewhat.  Did he also mention to you that you will be paying self-employment tax for Social Security and Medicare, since it is not being withheld from your pay?   And that he is not withholding any federal or state tax--so you have to pay it all?

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

HOW/WHERE  TO ENTER A 1099Misc

https://ttlc.intuit.com/questions/2893392-where-do-i-enter-a-1099-misc

https://ttlc.intuit.com/questions/2903027-how-do-i-report-income-from-self-employment

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs