The main needle (HSN-high speed needle) is on the carb where the fuel line enters, the bottom needle (LSN-low speed needle) is on the slide that pulls out of the carb, and the idle screw is on the side of the carb. As for the first time starting, pull out the glow plug and drop some ARO (after run oil) in the hole to lubricate the piston during the first dry start. Also if you have trouble starting, since their will be sooo much compression, loosen the glow plug up just enough to make it easier to pull start, once started re-tighten the plug. Make sure the air filter is secured well, and test your radio equipment to make sure all servo's appear to be working correctly. Good luck and enjoy