Great advice given to me while flying the ERJ-145 many years ago, was to simply put the N1 needles to 12 O'clock if you are unsure of airspeed.
this gave a power setting that was pretty unlikely to induce an overspeed, but was enough to avert a stall as long as you flew roughly level. The thing would bumble along at about 200 knots if I remember correctly.
I think all aircraft could this sort of general advice, but I can also think of a few reasons why I've never seen it written down.