Option 1: Take the plunge as a DM, announce before hand that you're new at this. Everyone who thinks they can do better is free to give it a try.

Option 2: Local Game Store.

Option 3: reddit /r/lfg. Google how to turn a search into an RSS stream, set up a search, be ready to jump into worthwhile-seeming posts quickly. Be ready to go through a few bad/mediocre groups until you find something that clicks.