your quastion wasn't very clear, but I'll have to assume that you wanted a player to recive money for killing units.
to do so, you create a trigger with (example:) "player 1's kills score is at least 1" and actions will be: "set score for player 1 to 0", "give player 1 5 minerals", "preserve trigger".
'player 1' and '5 minerals' were just an example for player and money.
if you want a different amount of money for every unit, you need to know how much score you get for killing every unit.
for example, you recive 100 kill points for killing a marine.
so you create a similar trigger only with "player 1's kills score is exactly 100".
if you wanna know what score you get for every unit you can:
1. download arensal3 and check yourself
2. be patient untill I edit my post and link you to a list of all of them.
[edit] here ya go:
http://home.earthlink.net/~bluemicrobyte/starcraft/id23.html