lookin for scripting info. on making a HALFLIFE MOD

does any one know all the stuff in terms of code that you need to do to make a HALFLIFE mod... we have have not yet started production because we are skilled in all departments EXCEPT for CODING...

so if any one could just give me an idea on the certain stuff that we need to code for, and or any tools or programs we could use it would help... we are eventually gonna look out for scriptors to do this stuff for us but we want to have everything ready first...

thx a million to anyone that can help us out...

-Brodiis