Default [Q] Root & Flash Samsung Galaxy Ace S5830

Hi, I managed to successfully root my fone last week but when I tried to install ClockworkMod Recovery 6.0.3.7 from the SD Card I am now getting the blue screen with the phone eventually booting up ok. Does anyone have a simple step by step guide as to the steps I need to do to revert this install and start again with an older version of CWM? I'm a newbie to the rooting/flashing of devices but fairly competent following guides and installing files etc. so any help would be greatly appreciated.

Paul