[Munch's Master]

This is an OK start. I'd advise you spend a bit more time fleshing out environments and actions though. Rattling off how they moved around, went to certain locations, chated, then had to return to work is fine for quick development, but for an introduction I'd advise you flesh it out a bit more. Introductions can work at a fast pace if there is immediate action, but if it's a passive introduction like yours, you want to progress slower and develop things further.

Just some tips: Describe the Barracks more. Describe the characters' appearance. Explain the relationships/links between Sam and his friends (names help too). Also, elaborate on Sam's thoughts about the Mudokon Pops- perhaps give him a voice, so we can 'hear' inside his head'.

A tip I'll give you for down the road that has become something I tend to do is- don't make any characters incidental. Even if they have 1 scene with 3 lines, give them just the tiniest bit of personality or backstory. It again makes everything more real and composite. But don't worry about that until later, as it can be hard to control (there's characters I've intended as incidentals who have become minor recurring characters, for instance).

Anyway, yeah it is a good start for a new writer, it just needs fleshing out a bit. You could have a real good and interesting story here, so keep going!