1. check the control settings.(these keys are on the num keypad.)
2.not sure
3. its a switch level, hold it to apply pitch. for 109 check the prop pitch angle indicator guage.
4. press alt and left click mouse. a right click context sensitive menu will then appear when window is active and right clicking on it. a wealth of options before you.
5. the non oil is the water radiator.
6. varies for different aircraft. keep it @ 90-100 i reckon.
7. i use the steam screenshot system. check your steam menus. apply a push to take screenshots key see comment 4 to remove UI info.

dont forget to read the manual too