short 2-3 encounter adventure lvl 1 + druid companion question

[Wibs]

Hello,

I am about to GM my first game soon with a party of 4 players in the Beginners Box adventure. But, as no one of them has played any RPG before, I was wondering, if there is a short game I could play with three of them before we start with he Box. There are the Beginners Box Bash adventures, but they seem to miss something I would like to see. Probably I want a few maps together with some combat and social quests, where we could use miniatures for moving around. I have never DM'ed either, so I can't make one myself. As this is an introduction game, I don't think it should be over 2-3 hours.
Could someone suggest one please?
I think I could make something myself, but I have small doubts in my skills. Especially the social quest making part :) Ideal would be a turning corridor with a few rats+skeletons+trap and a "convince or fihgt" boss in a throne room.

In addition, (it is probably in the wrong place to ask, though) can it be possible, that a druid badger companion can have base 15hp and 17 AC at level 1? Sounds like really hard to hit and kill.

[Shadowlords]

Pick up one of the Lvl 1 Modules, they are short and quick, and pretty fun, We Be Goblins is a good one for new groups, no character creation, it gives you the character stats from the start.

[Mark Hoover]

The first few pages of Rise of the Runelords is good for what you're looking for.

RotRL:

The PCs come to town for a festival and the town is attacked. The PCs help take out the threat, are met by a few NPCs and hailed as heroes. Once this initial threat is over the heroes encounter a few extra events like hunting a boar or escaping an angry father after kissing his daughter.

The "extras" are supposed to build engagement in the game world, specifically the starting town. It's leading up to when the PCs are going to go on an adventure in that town to foil an evil plot.

You could just as well segue from those events to the Beginner Box adventure. I hope this gives you some fun ideas!