So, like when someone or a certain humanoid (make sure to include that part) gets killed, say it will add one point to a GUI that counts points from every kill. (the points thing I got)
My Second Question: Also, I'll need to use some addition math, so when a kill is added, give +1 on the GUI, so say I have 13 points, and I kill someone or something, and I now have 14, how do I do that scripting wise?

4 comments
http://wiki.roblox.com/index.php?title=API:Class_reference
You could either see if the humanoid's health is 0 or you could tag the player that's hitting it and use the on death event to give that player a point.
http://wiki.roblox.com/index.php?title=API:Class/Humanoid/Died
See also: https://scriptinghelpers.org/questions/17501/what-is-the-creator-value