The first thing we need to get straightened out is your starting technique. Brushcutters, chainsaws, and other tiny 2 strokes that use all-position diaphragm carburetors pretty much all start the same way. You turn on the ignition, set the throttle to the start position, apply full choke, use the primer if it has one, then pull the starter several times briskly. If all is well, after about three pulls the engine will start then stall after a very short time - usually less than a second. You then open the choke to the part-choke position if it has one, or if it hasn't, open it to about 3/4 choke. Leave the throttle in the start position of course. Then you pull the starter again. Normally it will start on the first pull this time, since it has a belly full of fuel from the full-choke run it has just done. After somewhere around 15 seconds to 1 minute running that way, you will notice some smoke in the exhaust and it is time to open the choke fully. Then all should be well, though you may have to wait another minute before it will idle (meaning, you wait before you release the throttle from the start position). Don't let it idle for long, even after warm-up, or you'll probably foul the spark plug.
From your description you have been keeping the choke applied. Consequently raw fuel was ejected into the muffler and a few other places.
Please try following the above instructions, and tell us what happens.
