Well , lets talk about design rules :
But before that : the point between c1 and c2 ( common point , should be connected to the ground , directly ).
And about value of C1 and C2 , as you probably , know , one of the oscillation laws , is , Av*beta , should be about 1 ( you'd better to set it greater than one ) . and beta is the ratio of C2/C1 and AV is C1/C2 . let me , give you an example : you have Av without feedback that is around 5nf ( for example ) . so C2/C1 should be about 1/5 nf . ( in practice , a bit greater than this .) .and Fr=1/2pi*sqrt(LC) C=C1+C2 .
And about CE amplifier design , i think you know how to design a simple CE amplifier . isn't it?
Best Wishes
Goldsmith