Don't try to do it all at once - it'll end in tears.
Just take one servo and work on controlling that.
Make sure you've got a separate power supply for the servos.
You'll need to use something like MegaServo, because the standard servo library only supports two servos.
Start off just using the serial monitor to send your commands to the Arduino, so you're not having to debug and develop two lots of software at the same time.
When you're happy that the Arduino end of things is working, start on the Processing.
Good luck.