Is there a beginning adventure/module you would recommend?
That’s not really a thing Fate does. Fate is very much designed to be a collaborative game, with emergent adventures. That is, the idea is that the GM and the other players create the adventures themselves as they’re going. In fact, for the most part, in Fate, the entire campaign/game world is supposed to be an emergent product of a collaborative process.
You mentioned upthread that you had gotten a copy of Atomic Robo: The Roleplaying Game. Take a look at “Brainstorms”, on page 132. Basically, the GM gives the other players an initial mystery. The other players, through their characters, discuss, research, and investigate the mystery. And through that process, they create the adventure themselves. They don’t try to figure out “the” solution to the mystery that the GM created or is reading out of a pre-made module. The players are creating the solution themselves.
This takes a very different sort of mind-set from traditional RPGs. It’s one I personally have never really been comfortable with. It’s certainly possible to run more traditional adventures in Fate, where the GM runs the players through a pre-made adventure, but that’s not how Fate is really intended to be run.
By Fate standards, Atomic Robo: The Roleplaying Game itself pretty much is a beginning adventure/module. It gives you a mostly pre-built world, campaign frame, antagonists, and even characters that can be used as pre-generated Player Character protagonists.
If you’re looking for more material, Evil Hat produced a line of Pay-What-You-Want “Worlds of Adventure” for Fate Core. There sort of combination adventure starters/campaign frames. That’s about as close as Fate gets to pre-made adventures.
Okay, cool. I had assumed as the GM, I would have to have some series of aspects prepared, like possible threats, mysteries to uncover, NPCs, foes, even if it didn’t amount to a complete story.
That’s how I run Fate; I absolutely set up scenes (with aspects and NPCs), plotlines, information, etc. I don’t generally do the same amount of blocking out of scenes the way I have in the past when I ran D&D and similar games, but as a Fate GM, you don’t have to necessarily assume that your game will be a total sandbox, either.
That said, gdave is correct – while I’ve seen Fate settings that do have intro adventures included with them, they usually aren’t as fully fleshed-out as what you’d see in a D&D adventure.