Fresh fuel and a fully charged, in good working order battery are necessary prior to attempting to start. If in doubt verify before attempting.
Starting procedure is normally: Engine vertical works best for me on initial starts, not tilted way up or way down. Fast idle lever all the way up, gear shift/throttle lever in Neutral, squeeze the primer bulb located in the fuel line to the engine till the bulb gets hard.....resists further squeezing. Turn the ignition key to the first position: ON.
If a separate primer button is supplied push in and hold for 5-30 seconds depending on how long it's been since the engine has been operated...longer, the longer. If key push type primer, push in on the key and hold for that interval.
Roll the key over to START while still holding the button/key depressed and allow the engine to crank for 15 seconds. If no response, squeeze the bulb again till firm and repeat the process several times as required. If it doesn't light off you have a problem to explore.
Once it lights off, reduce the fast idle lever such that you are controlling the RPMs at about 1500. If the engine stumbles, push in the primer button/key till it recovers and release....repeat as necessary till it warms up sufficiently to run on it's own. Put the fast idle lever all the way down and be on your way.