You need to file a Form 1065 (initial return) for the LLC that started business in September.
See https://www.irs.gov/instructions/i1065#idm140538038032800
If you happened to make an S corporation election (by filing a Form 2553, which appears doubtful), you would have to file an 1120-S.
See https://www.irs.gov/instructions/i1120s#idm140155513575488
If you and your spouse own the business as community property (you are in a community property state and did not file an S corporation election), you can treat the LLC as a "qualified entity". In that instance, you could elect for each of you to file a separate Schedule C rather than a return for the LLC.
See https://www.irs.gov/pub/irs-drop/rp-02-69.pdf
Regardless, you should seek professional tax guidance and, possibly, income tax preparation for this situation.
