When you fly on a liner, your
indicated airspeed is always around 300 knots, this doesn't mean that your
true airspeed is such. In fact, depending from flight level and air density, you are flying at a WAY higher real speed, and depending from winds your
ground speed might be even higher (if the wind blows behind you) or slower (if the wind blows in front of you) than
true airspeed.
Trim, well, trim is a quite complex matter to explain, but in a nutshell is a set of adjustable moving little surfaces on the rudder, elevator or other moving wing surfaces that allows the plane to move in the air at different speeds keeping the desired flight attitude with little to no force applied to the yoke or pedals.
I dare give you two suggestions: 1) follow the flight lessons in FS9 before trying to fly seriously (simple flight for the heck of it doesn't count

). 2) start from little to grow in the bigger, meaning start with the Cessna to grow in the Lear, in the 737 and onto bigger and more complex planes.
There's but one real cure for human stupidity. It's called DEATH.
At the moment mourning the assassination of sarcasm and irony for the good of the "higher".
Proud FSIX user. Active user of FS98, X-plane and novic