I mostly fly in and out of class C airspace around Washington and Oregon. When I file a IFR flight plan do I make initial contact with CTR upon departing my departure field? (since there is no CLR,GRD,TWR at my departure feild). Then on decent to approach will CTR clear me as filed into my destination airport? Thanks for any replies.

VATSIM operates a top-down policy. If there is no underlying position (DEL, GND, TWR, APP etc) then CTR will provide these services. Contact CTR on the ground initially as will likely be providing aerodrome services as well particularly if a towered airfield. Phillip Speer