Welcome to the forum!
I'm not familiar with the Long brand. The control valve (what you use to move the loader) is with the loader itself?
I'm assuming there's 4 hoses coming off the loader, is that right? Look for 4 corresponding connections on the tractor itself. They're often in the area in front of or below the floor plate where your feet are. They're commonly color coated or numbered. If you have those connections, you should be good to go. Match the color/number hose on the loader with the connection and try the controls.