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The KX 125 is a two stroke and is lubricated with the fuel. A good quality synthetic two stroke oil will be best in my view as the engine is used by many manufacturers including Aprillia in their RS 125 recomend it. Halfords do a good few types. It has a pump that meters the oil into the float chamber of the carbourettor, very cunning! Unlike my 1956 Lambretta LD150 that used 18 to 1 petrol to oil mixed as it goes into the fuel tank. Yours uses about 45 to 1.
Clutch plates are probably toasted. Drain the oil, remove the cover where the clutch cable goes into and check them out. Not hard to replace but you do need a special tool to get the plates off/on.
Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. If in a hot area like Texas or New Mexico go with 20w50.
Use TWO STROKE ENGINE OIL in the pump. If not using an automatic oil pump, then mix the gas and oil 32 to 1. That equals 4 ounces of TWO STROKE ENGINE OIL to one gallon of gas. NEVER use motor oil in the gas. Only two stroke engine oil.
there will be a number on the crank case by the place where you pour the oil in. It will be im millileters so you will need to convert or measure with mL, usually its about 650mL or so for 125s.
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