Is that a straight-shaft brushcutter (that is, with bevel gears at the cutting head end, not a curved shaft)? I can't find any reference on the internet to that model, but generally Oleo-Mac has one series of two-digit model numbers that are about 2 numbers higher than the engine size, so yours may be about 38 cc - a reasonable size for a straight-shaft, fairly serious brushcutter. Oleo-Mac is an Italian company but appears to have its brushcutters made in India.
It appears that your engine is not receiving fuel, but I would not begin by rebuilding the carburetor. You need to check the fuel pickup in the tank (filter-head not blocked, hose not split), verify that air is entering the tank (it will either have a vent-cap with a one way valve, or an air pipe going into the tank, and both of them give trouble), check that the carburetor filter (fine mesh in the chamber above the fuel pump diaphragm) is clean, and ensure that the crankcase pulse line to the fuel pump chamber (it may be an external rubber hose, or a drilled hole into the crankcase from the carburetor) is clear.
Are you following the correct procedure with the choke? It is similar to a chainsaw: you close the choke completely, set the throttle to the start position (on some models you hold the throttle partly open by hand), turn on the ignition, and pull the starter until the engine burps (runs then stops). You then set the choke to the halfway position, and pull the starter a few more times until it starts and runs.
If you have a clean, working fuel system and the engine won't even fire a shot when you use the correct starting process, it is time to start thinking about a carburetor overhaul. However I think many more carburetors are ruined by enthusiastic owners taking them apart, than ever deteriorate in service. Try everything else first.
