If you are a single member LLC and have not incorporated for federal income tax purposes then you will just file a Sch C.
See this TurboTax support FAQ for entering self-employment income - https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/report-income-self...
See this TurboTax support FAQ for entering self-employment expenses - https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-self-empl...
