As VolvoGirl said, unless you specifically filed a form (Form 2553) to treat the LLC as a S-corporation (or Form 8332 to be a C-corporation), you do NOT file a corporate return, and there won't be a K-1.
You just enter it as a Self Employed Business on Schedule C. Just follow the directions for a "Business". Your State may have other requirements for an LLC (such as California), so keep a lookout in the State interview.
As a side note, if you are considering the S-corporation election, I REALLY, REALLY to NOT make the decision until you have gone to a tax professional to analyze your specific situation. Most small business owners like you do NOT being their business as a corporation. A corporation is A LOT more paperwork, requires A LOT more tax filings, and can be more expensive in some cases.
