You can file a single member LLC as a Sch C.
You will need TurboTax self-employed for the on-line or TurboTax Home & Business for the CD/Download version.
For more detail see below and also put in how to do an extension on the 2016 taxes.
https://ttlc.intuit.com/replies/5436487
https://ttlc.intuit.com/replies/3301811
