ie, some people prefer Tracks, some prefer Routes, some like to use both.
I'm a fan of having both. IME, things often go wrong on the road with a route, and having the track there is a great fallback.
As FF says for routes, I'd advise having the track two parts, out and back, with < 500 points each.
Just duplicate the track in mapsource. Select one copy and delete all the track points after a middle control (in track properties). Make a note of the point number that you deleted from, and delete all the points up to that in the other copy. Then filter them each down to 500. Set the colours to something easy to see, like green.
Save the result to a gdb file and load it up to the Garmin.
If short of time, I wouldn't bother with the route, even though the beep-beep and light up is really nice to have at night.
Have a good ride.