How do I replace some sound ??

I want some sound effect from HL1 to be in this game eg. Med Kit picking sound, Opening weapon hud sound etc. I already have HL1 sounds what should I do ? I have no experience about modding. Anyone has a guide for doing this ? In workshop there aren’t everything I want so I decide to create what myself.
I don’t want to create an advance mod such as texture but only sound replacing.
Thank you :slight_smile:

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.