|Such a sleepy outpost...|
The good news is you don't need to do much fighting, yet. Human footmen are scattered around the map, but they won't attack unless the peons venture too far outside of town. Also, the three starting grunts are more than capable of killing all opposition on the map.
The first step is to venture north to the gold mine and start mining gold. That was easy.
|Hark! A gold mine!|
Now just wait for your peons to obtain the necessary wood and gold to build the required structures in town. Grab a coffee or something.
The developers at Blizzard must have quickly realized how long and boring this mission is. In Warcraft II, the objectives were changed to four farms instead of six.