citation Longitude, what am i doing wrong

Hey there guys,

hope you are having a blast with 2020, like i do.

There´s one issue i have with the longitude. I can´t seem to get the fms to work correctly. I load an ifr-FP, switch the source to fms, switch on nav, vnav and the fd but after takoff (also i have no clue how A/T works, if i arm it, it already pushes the throttles forward without TO/GA being pshed and retracts them immediately on rotation) the FD commands level flight.

any ideas or is there some basic manual available?

thanks all, and have fun!

regards,

Manuel