I found a wiki that had the watch order. Though I didn't watch Origins yet.

Stargate (1994 film)
Stargate Origins
Stargate: SG-1 (Seasons 1-7)
Stargate: SG-1 (Seasons 8-10) and Stargate: Atlantis (Seasons 1-3)
Stargate: The Ark of Truth
Stargate: Continuum
Stargate: Atlantis (Seasons 4-5)
Stargate: Universe