hi all!

my first post here, as i eagerly await my Becooling waterblock and my blackice radiator

hehe
newbie questions:
1/2" or 3/8" - whats the difference and which is recommended?
currently my block has 3/8" barbs. radiator has 1/2" connectors (barbs..what ARE barbs..

are the radiator connectors called "barbs" too?) so will using adapters and converters actually deterimentally affect the system somehow?
also, could someone tell me EXACTLY how to fill and bleed a closed system. i read about using a T-line..but still kinda hazy..
thanks in advance! looking forward to a pleasant stay here