High Power .......??
Try a MOSFET-based design, such as this:
https://www.microsemi.com/micnotes/APT9903.pdf
It's for different frequency, but the whole idea behind stays the same.
Of course, an amplifier should be driven by oscillator. It is, however, possible to design an oscillator with 500W output power, but its generally a bad idea. There would be some issues, mainly with stability.
What do You mean by guiding a power in certain direction?
You want to transmit it as electrical signal, or as electromagnetic wave?
In the former case, a coaxial cable should be enough, however a care should be taken when choosing one. Find attenuation per unit length of a particular cable and calculate amount of power, which that cable will dissipate as heat.
Also, You should match amplifier's output impedance to cable's impedance, the same goes on load's side. The load should either have the same impedance as cable and amplifier, or be equipped with impedance-matching circuit.
In the case of transmitting a signal as electromagnetic wave, all You need is a directional antenna, which will be huuuuuge at this frequency.