The suggestions you have received so far are good ones. Follow the manual, particularly the high and low end needle setting instructions. If I were you, I would take the cowl off for the break in period. This allows you to see what's going on and make the adjustments safely.

With the cowl off you can remove the pressure line from your muffler and then fill the tank. When fuel comes out that pressure line the tank is full. Reconnect it to the muffler and you're ready to go. MAKE SURE THE PLANE IS FULLY RESTRAINED.

I assume you've looked in your carburetor and made sure it is fully open at the full throttle setting on your transmitter and open only a slight bit at the idle setting. Open the throttle without the glow plug connected to prime the engine then reduce it to idle. You may need to open the throttle 2 or 3 clicks to get the engine to start. Then just follow the manual.

OS makes a good engine and if treated right during the run in period they last forever. If you're considering staying in the hobby and perhaps moving up in engine size, consider investing in a good electric starter.

Best of luck!