1. Vtec does not work at all.

bad ground, check harness at ecu, check all plugs for good connection

3. I hear like a humming noise coming from the front of the car.

Wheel bearing??

5. When the engine is warm and I come to a stop at a light or something the idle tends to drop to like 500rpms.

there is an adjustment on your TB to raise it up or distributor/ignition timing

just some thoughts

How did that vss plug work out for you?