I need help making a sneaking mission in my game.

Hey, I wanted to try to add a metal gear sneaking aspect to one of the missions in my game. I am using yanfly scripting if that helps, however, I am still a newbie at this and would not mind a step by step 

guide to making a successful sneaking mission. nothing fancy just getting pass a couple of guards here and there otherwise If I get seen I get into a fight or get thrown out of where I am etc. Any takers on help?

thanks in advance.