As you noted in your questions, schedule 1 is where additional income and adjustments to income will be reported. The 1040 form has been changed this year. There is no longer a 1040A form or 1040EZ form. There is only a 1040 form and 6 schedules (if the tax return requires them). All amounts reported on Schedules 1 to 6 will then flow into the 1040 form.
Schedule 1 is where additional income, such as capital gains, unemployment compensation, prize or award money, or gambling winnings is reported. Adjustments to income reported on Schedule 1 are for items such as: student loan interest, self-employment taxes, educator expenses, and self-employed retirement plans or health insurance deductions.
Here is a link to the copy of the Schedule 1 form: IRS 2018 Schedule 1 Form
