Ooh! Nice hull.
Because there are at least 3 sails on the schooner model, the exact sail plan is not critical, nothing as sensitive as it would be on a bermuda rig. I significantly adapted (freelanced) the sail plan on my schooner model and it still handles fine.
You could easily make a sail plan based on the photo on the Mobile Marine website.
I used Dacron sail material from a sail makers yard and used paper templates that were struck off from my masts and booms (in place).
The rigging plan on my model is also simple. The masts run through a hole in the deck and the thwarts that support the deck. Then stepped into a piece of ply glued above the keel. The mast needs to be slighlty swept back so the keel steep is glued slightly forward of the thwart that it runs through. Note that the thwarts are curved to support a curved deck. It does not have to be a curved deck, but it is better if it is, for drainage. I am sure there are loads of tutorials/builds showing how to do a curved deck.
This soid fixing of the mast supoorts means that the mast stays are mostly aesthetic. There is a forestay, a triasic stay (from mast top to mast top), and side stays that are fixed to pieces of wood glued to the hull, just below the rubbing strake on the hull, just aft of each mast. Because the masts are 'keel stepped' there is very little force on the stays or their mounts.