Defensively, you'll be more concerned with the purple guys, who have camps not far from you to the east and south, effectively surrounding you. There are two Protoss Tribes with two camps each, signified by red and purple. Aerial attacks, obviously, may pass right over the wall, so you will want to fortify the southeast with anti-air defenses. Your base has a good defensive wall that limits attacks by land to fairly small entrances on the northeast and southwest sides. First, though, we'd like to give you a detailed overview, so you can go off script if you like. We'll lead you through a more conservative approach, as this mission becomes much easier once you've build some momentum up. Like the last mission, this one has a single target, and can be completed relatively quickly if you're good, but unlike the last one, you start with no resources, and the slow build and emphasis on defense make this relatively difficult.
Below is all the info you'll need to beat Protoss 8: The Trial of Tassadar.