Now, let me explain the very first Hi needle adjustment for your first start.

I advise at the beginning to set the Hi Needle at one half of a turn (from closed).
At this point, the gas quantity flowing will correspond to a proper quantity of air which will be found by moving the Thr stick. The engine will start when needle and opening will correspond.
Usually, we adjust the needle for a given carb opening, which corresponds to a given air flow.
Here we do the opposite: we adjust gas needle first and then find the proper air input by adjusting the Thr carb opening.

This will allow your engine to run and start breaking in.

After some time (say 15 min), you will rise the Thr a bit and open 1 click the gas needle. Then you will refind the proper air input by adjusting the Thr to match the new needle position and let it run (another 15 mn), this time the engine will run faster , more RPM. Be light handed with those adjustments !

And so on, until you reach full RPM.