I just started playing Find Mii on the 3DS and I can't get very far at all. When I hire a wanderer most of the time it just runs away from the thing it encounters and then I have to use coins to get another one. At this rate I will never get far in this game. How do you get a Mii to play the game so I won't have to keep using my coins to hire a wanderer? I can't even seem to get any Mii's to come to my plaza via Street Pass in the first place. There was one Mii that I noticed was in my plaza but I couldn't use them to help in Find Mii. Can someone explain how I can farther in this game because it's very boring and frustrating at the moment. Also how do I get more accessories for my Mii?
In order to get Miis for use in Puzzle Swap and Find Mii, you must StreetPass with another 3DS owner, which basically means you have to be in wireless range with their system for long enough for the two to realize each others' presence. Once you do this their Mii will appear in the two games.
For Find Mii specifically, a Mii will be no more useful than a wandering hero, dealing 1 damage per hit and bolting for the hills soon after. You have to tag that 3DS multiple times for them to level up to increase their damage output. There is nothing you can do to stop a hero (wandering or Mii) from abandoning battle once they do something, unless they just sworded something to death or won the battle.
Miis you find in your plaza that aren't from StreetPass are those you've seen in other games, like the Miis you play online in Mario Kart 7. They're dead weight.
Mii accessories are earned by completing levels in Find Mii. To get all of them you must play through the entire adventure multiple times.
TL;DR: One's fun with the Mii Plaza is directly proportional to how many other 3DS's are in your daily stomping grounds. And this isn't even counting the artificial constraints (e.g. some levels are point-blank impassible without a certain colour of hero).