Exactly how do you start a Pure Trust Organization of UOBT

Hello, So i have read Redemption 5 Series 2 and skimming back through it it doest really say where exactly is the trust declaration is supposed to be filed. That the only placed I am stumped at. Does is have to be filed with a county clerk office for it to be established? i know registering with the state is our , just trying to get some clarity