That's impossible to say without seeing the plane. Just the inspection is going to run you a few hundred dollars...the problem is, if you are looking to buy a fifth-owner plane that's 35 years old and has 300 hours on the clock, you are going to spend far more to get it into flyable condition than if you're looking at a 35-year-old one-owner bird that belongs to a guy who puts 20 hours a week on it. The worst thing you can do to a plane, besides crash it, is to never use it.
It depends on the airplane. i.e. a cessna needs around 70 knots while a Boeing 747 needs around 250 knots.
It depends on the airplane. A Boeing 747 needs to go 160 knots before you can take off in it; a Cessna 172 needs to go 55 knots to take off.
As many as it needs.
Cessna company offers many types of jets and airplanes to suit your needs. They offer single-engine aircrafts as well as a wide range of types of jets, and turbo-props aircrafts. Some examples of their aircrafts are the Cessna Skymaster, Cessna 305 Birddog, Cessna Conquest II and the Cessna 185 Skywagon.
Everyone who needs to get somewhere.
to gain speed for take off
It needs good fuel efficiency for a start.
It then produces lift due to wing configuration and can take off
a 500 lb plane needs approximately 100 HP to sustain flight. Use that ratio for the desired airplane
A spacecraft need a rocket engine (which is powered by on-board oxygen and fuel) to propel itself, an airplane only needs a jet engine (which only needs on-board fuel as it uses oxygen form the air).
A plane needs air, a rocket doesn't.
For an airplane it vibrates a lot and it needs a super- or turbocharger at high altitudes