In this scenario, a Form I-765 request for initial work authorization should only be filed if you concurrently have filed or have pending a Form I-485 adjustment of status application. A K-1 fiancee visa, being in the nonimmigrant category and usually valid for 90 days would probably not suffice in this situation. If you entered the US with a K-1 visa, you must understand the strict limitations placed on your by virtue of your entry in to the US in that status.
Answered on Nov 27th, 2013 at 12:18 PM