design a vco with a packaged transistor at microwave freque?

1) how can I design a vco with a varactor for a frequency range (8-10GHz) ?
with computer optimization? what is goal?
2) what is practical condition of oscilation?
I think that in classic books (for example Gonzales) they are very ideal.
in the papers they use some different conditions.
I need the best and practical condition for design a vco