I give you your map:
[spoiler=Tau Base]

[/spoiler]
You will have to enter from the left. Technically you could enter from a different point on the perimeter of the base, but this is the nearest edge to your target. The base is just too big to reasonably fit into one map.
The building on the far right is the prison (plus interrogation room)
The building on the bottom right is the medbay (plus medical storage)
The building at the end of the road is a garage/repair bay. The fuel tank outside is a medium explosive (see covert operations rulebook, but to summarise it could be a useful distraction)
The round thing at the top is the fusion generator powering the base. They have backups for some critical systems, but mostly everything is powered from there (including the laser fence).
The building near the laser fence is a barracks. Some Tau reinforcements will come from there is the alarm is raised
The other two buildings are mostly storage.
The Laser fences are impassable terrain (except for jump infantry and skimmers), but the fence posts can be destroyed (Toughness 7, Wounds 2, Armour Save 3+) which will deactivate the lasers coming from it.
Expect enemy reinforcements from all the board edges inside the base.