Lol... You guys are funny!
First of all THANKS! for all the quick replies... very appreciated....
1st problem is solve... Indeed the Power steering fuild gauge was a bit low when car is stopped...after a little run to recheck the noise, opening this would show me oil with bubbles in it.. so yes, the pump was pumping air due to a low fluid level.. that was the noise... I feel a bit stupid to not figure this out by myself.. But I'm a geek and work in the video game industry.. my mechanic skills are kinda low... hehe.. I learned here.... I will defeniletly monitor this over the next month is levels goes down again: leak...
As for the creaking noise... I would try to spray a lubricant under it.. but also concerned that there is an air bag near, and my vehicule is still under ford warranty, so I would probably just have a visit to my nearest dealer to be safe...
Thanks again !!