pulse mode on sensor question

I have a few questions:

  1. if I use a lot of sensors with pulse mode running all the time, am I going to use up too many resources?(what I’m using the pulses for)

  2. are “if” statements the proper way to change the color of something when I mouse over it?

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what I used:

import bge

cont = bge.logic.getCurrentController()
own = cont.owner

mouseover = cont.sensors["mouse over"]
notmouseover = cont.sensors["not mouse over"]
keyboardup = cont.sensors["up"]

if notmouseover.triggered:
        print ("false")
        cont.owner.color = [1,1,1,0]
    
if mouseover.triggered:
        print ("true")
        cont.owner.color = [1,255,1,0]

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  1. where do I enter/attach python scripts that I want to run every time I start my game?
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-Garrett