So it's the Schaller Floyd. Also Floyd Rose original should fit then. Tuning the guitar is very easy. Loosen the nut screws and tune the guitar with the normal tuners. When it's in tune lock the nut and make the fine tuning with the fine tuners. When you turn clockwise it will rise the tune and when you turn anti-clockwise it will lower the tune.
I suggest you put all the fine tuners somewhere in the middle when you're going to open the nut screws and use the normal tuners. When you lock the nut screws again you will be having some space to both directions.