To start the building you need 12.5M silver, 2500 Ale, 2000 Timber, 1500 Steel, 2000 Plates and 200 "Scrolls". It is not possible to use Gold for upgrade. Building time for level 1 is 1w 5d. Only the Chief or any of the Elders can start a construction process, but all clan members can send rss to the Stronghold Resource Storage.
For speeding up the building process or the Thoriar production you use a Stronghold Boost.
The Mintage yard converts Silver to Thoriars.
For level 1 the stats are
Maximum of Thoriars recieved: 2000
Stronghold Influence: +62M
(someone else can make a proper table later)