Cotrolling 3 brushless motors, 1 servo, 1 led. and Arduino help

Yes you will need ESC's for the brushless motors. An Arduino UNO will be fine for the control side of things, you will need some quality RC Batteries to drive the brushless motors as well.

This is using toy motors but might be of interest to you -

Duane B

rcarduino.blogspot.com