About second question make a grunt (Steve) click on it and check box "Activate"
Then add the some pathnodes in Level Editor
Then type the script
and
Yep you have to do some work two and you are like me you make question what will other solve for you,and as many said you WON'T learn by that. Not attacking you i know you are new but give some try
And really if someone helps you (not telling me) you can give some feedback +reputation
By clicking a little box with some green + (plus) under a Profile
About pathnodeson't make them to far and if wanna make monster breake door then just put pathnode forward door (Don't make pathnodes where can monster glitch)