If your employer reported your income in box 7 of your 1099MISC it would be considered self-employment income and subject to self-employment tax (computed on Schedule SE) (which is based on amounts in  Schedule C). Schedule 1 and Schedule 4 are new schedules that have been introduced in 2018. These schedules represent some of the line items that used to represent some of the line items on previous years 1040. Schedule 1 and Schedule 4 include line items such as taxable refunds, business income, unemployment compensation, and self employment tax etc.

If as mentioned above, you have box 7 completed on your 1099MISC, you would need the corresponding schedules to compute the correct tax.