That's not a bad plan at all.

Another thing I'd suggest is make sure you know how you want the players to operate. Can they run off to play solo? Are you expecting them to work together as a team? Is this a "don't split the party" roleplay? Will there be multiple groups of players? Can they try to split up to tackle different jobs and stop different bad things from happening at the same time?

Ask yourself, too, how much narrative control you want the players to have. One roleplay I'm in right now, Age of Dawn, is really free form and sandboxy, and we players even get to make up lore as we go in a way. The GM lets us write out the results of our actions, even, and has us talk to each other when we have conflict. But the GM also writes personalized responses to everyone's actions which might be only a few paragraphs long or may be a small story in and of themselves. The GM creates events around the world that force us to take action. It works really well.

In that same RP, we have something like what [@NuttsnBolts] suggested: everyone has a goal. The GM was VERY clear that we needed goals. It's helped a lot.

EDIT: As an aside, strawberry ale tastes odd.