The Lord will guide you by revelation just as He called you. You must ask in faith for revelation to know what you are to do.
This is a great article on callings! Everyone should read or listen to it. I have also made a handout with the 3 points.
https://www.lds.org/general-conference/2002/10/rise-to-your-call?lang=eng
I put together a 9 min video, just clips of this talk!
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