Some radios have no throttle cut off (Spektrum DX7 for instance) so you don't have a switch to cut the throttle when you are done flying. So, the trim becomes both a "throttle trim adjustment" plus an engine cut "switch". So, when setting the radio up for proper operation, the trim should be about mid range. This gives you enough room to go high-idle or lower idle, and room to move the trim down enough to cut the engine competely.

Even if you have a radio with a throttle cut switch, though, you would probably want the trim set at mid range with the engine operating at it's (your chosen) idle RPM. Then using the engine kill switch should close the carb to the point where it shuts down.

And, as GaRCfield said, it's a straight-and-level hands-off operation you seek on your first flight of the day. Please.. if you are not familiar with this concept, get some help. I would hate to see you do this, go hands off, and roll the plane into a dive into terra firma. Not a good thing.

Once you take off, a simple soft climb rate and a mild turn to get in the pattern will work. Then center sticks, and remove your fingers from the sticks. NOT YOUR HANDS FROM THE TRANSMITTER (neck strap attached of course or else you would drop it.. [:@] ). Put your fingers right back on the sticks and fly the plane. Determine how what direction you need trim.. right aileron for instance, then one click at a time, adjust it to the point where it does not roll. If it climbs, one click of down elevator at a time.

Once you are ready, FINGERS ONLY off of the sticks and see if it flys straight and level.

Remember, though, adding throttle means you've just untrimmed your plane and it will not fly straight and level at the new RPM (speed) and another trim adjustment may be necessary.

CGr.