Power settings for flaps 25 approach vary with weight. At about 24000 lbs or higher, the airplane will need about 19-24% torque. Below 24000 lbs, expect anywhere between 15-19% torque. The sim though, 20-25% works great, at 23 to 24000 lbs. A good average torque setting would be 20% (for profile purposes)

For flaps 45, in the airplane, expect to be 30-35% torque in the descent to maintain approach speed (we use Vref +10). Lighter = not too much difference, still about 28-34%. A good average would be 35%.
NDARMOUR speaks the truth (troof) about flaps 45. Nothing too difficult, just tempermental. Some smooth (smoove) landings, some not so much. Just keep the power in until the roundout.

As for flaring altitudes, it's tough to gauge. Flaps 25, your airspeed won't bleed off that fast so 3 feet is ok, but flaps 45...you do that and take out power = airspeed drops faster than you can blink. A good tecnique would be to keep the nose pointed down (on ref speed) till about 3 feet agl, with power still in, then increase pitch to reduce descent rate. About 1 - 2 feet agl (or when FO or CA braces for impact), reduce power and let it settle. Do this till you get the picture, then alter as needed.
Flaps 25 work best for crosswinds, but 45 do ok too. I've found that flaps 45 doesn't affect rudder control in the event of a large crosswind landing. It does add a little keel effect, so if it's really bumpy, it somewhat reduces the yawing tendencies.

NDARMOUR has a lot of experience in this airplane. More experience than I do being potty trained (I think). He definitely gives great advice!