Is each schematic a separate order?

Yes, each popular schematic has its own lot, and the bundle lots cover several in one.

What does a schematic do?

A schematic lets you craft its item before a run. The product page of each lot says what the item does and where the schematic comes from.

What is an Elder Sigil used for?

Elder Rifts need an Elder Sigil to enter, and Sigils are slow to farm alone.

Can a booster use my squad slots?

On self-play lots, a booster joins your squad. Piloted orders use your account directly.

Do Zombies camos belong here?

They are listed in the Modern Warfare III Camos category, since they are weapon camos tied to Zombies mastery.

Which schematic is best to start with?

That depends on your play style. Wonder weapons such as the Ray Gun add power, while Mags of Holding and the armor and mask schematics make long runs safer.

Modern Warfare III Zombies (MWZ) Boosting

Modern Warfare Zombies boosting: schematics, Dark Aether Rifts, Elder Sigils, Warlords, story missions, calling cards and Zombies camos, played by hand.