You might need to file a separate Partnership return instead of filling out Schedule C. Schedule C is for individual self employment, not for a couple. You need to fill out 2 separate schedule Cs, one for each of you and split the income and expenses. You might want to go to an Accountant to do it the first year and set up your schedule Cs right or do a Partnership return.
How to enter income from Self Employment
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...
Where to enter business expenses
https://ttlc.intuit.com/community/entering-importing/help/where-do-i-enter-my-self-employment-busine...
Here is some IRS reading material……
IRS information on Self Employment
https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center
1040 Schedule C Instructions
https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
Publication 535 Business Expenses
https://www.irs.gov/pub/irs-pdf/p535.pdf
