1) You say you are 'using the Newton theory' (presumably the one based on F = Gm₁m₂/r²). What other theory (or theories) are you using?

2) You say "if a planet does not revolve in the plane of the sun's own rotation and circle the sun counterclockwise, it will not be stable and its course will be deflected". What is the time period in which such an initially counterclockwise planet would be either expelled from the solar system, collide with the Sun or another planet, or change its orbit to a 'normal' one?

I appreciate that the answer to this question will depend on several factors, perhaps the initial counterclockwise orbit's radius, ellipticity, and inclination. Please answer the question with reference to the key factors.

3) The equations of motion of bodies under mutual (Newtonian) gravitational attraction are relatively easy to simulate, for a system like our solar system. Indeed, it may be that you can download some such, for free. Have you modeled your idea with such a simulation?