"Whats then stick input to hoover"

That is like asking for the control inputs to drive your car on the highway...

Basically you pull the airplane straight vertical and do whatever it takes to hold it there. Use your elevator and rudder and forget about the ailerons... If you do a little search around here, you will find hundreds and probably thousands of threads/posts about how to hover and tips and tricks to get better at it. It all takes practice!

As far as doing a flat spin on G2, it won't happen. Here is how to do one though-

Enter a normal spin with full left aileron and rudder, full up elevator, and half throttle. After a couple spins S L O W L Y move the aileron stick over without changing anything else and it should flatten out. Most airplanes with recommended throws will not do a very good one if they will do one at all. A true flat spin on G2 is not possible...