AeroPod, PowerPod and Newton

Live TSS and NP as in TraingPeaks and Ergomo would be good.

OK.
I've just ordered the trainer key. I am not sure which model profile to choose. Should I just choose any of the magnetic models?
Do I need to do a coast down on the trainer too, or just use the one of the included profiles.

One problem I could foresee is how tightly to screw in the part that contacts the wheel. I guess that the more tightly you screw it in the more work needed to turn the wheels. This would mean from session to session the resistance would change. Would this be a problem when using the ibike?

I have a generic magnetic trainer (Ravx TX3). Would any of the profiles already available be suitable, or do I have to invest in a new trainer?