This is VERY complicated. You first have to know where the planet is in its elliptical orbit at any given time. This is obtained from a planetary ephemeris. Then you have to transform the planetary coordinates in the Sun- centered coordinate system where the planets path is an ellipse, to the Earth- centered coordinate system for a particular viewing location on the Earth at a particular local time. This step will cause the motion of the planets to move, roughly, along the ecliptic but since each planetary orbit is inclined slightly differently, the sky paths will not coincide exactly. Also, the motions will be complex with changing speeds and even directions ( called retrograde motion) because of the changing relative speeds of the Earth and each planet in their orbits. Your best bet is to get a book on how to do astronomy with a calculator or a PC. I have seen several of these books present the necessary formulae needed to calculate RA and Dec from the observer's location on the Earth and local time.