The two white sticks in your latest photos are called sprits. The shorter one is for the rear sail, which we call the mizzen. The longer sprit is for the front sail, which is called a mainsail.
The sails are trimmed (or pulled in and out) by the blue lines we call sheets.
On your boat, the main sheet (highlighted in yellow) passes through the block (pulley) on the seat circled in yellow, goes up to the block (pulley) on the sprit for the mainsail, and down to the block on the other side of the seat. The ends are then passed through those cam cleats that are directly behind the blocks. Be sure to tie a figure eight stopper knot in the bitter ends of the line!
The mizzen sheeting system is a little trickier. This is different than the drawing. Fortunately, I tried this way on my yellow boat, before going a more conventional route. I’ve highlighted those lines in yellow, and included a photo of the line (not rope) routing on my boat. I hope this helps.
All of this is frustrating to me, as I offered to visit you last February 2023. In fact, I spent 10 days in Bokelia, and was semi-bored. Had I known you were so close, I could have looked you up. But you never responded to my offer, so I had no way of knowing. Water over the dam.
I hope this helps.