You have lots of ways, the easiest for beginner (that I find) is:
Finding weapon values... examples:
Say I used MHS (I don't but what the hey) and I placed a search on a value from 1-46 (or whatever the amount of weapons in the game are) and found something, then I went in the game and changed my gun. I went back to MHS and searched for a changed variable/ value.
Wowzas I narrowed it down to only 2-3 codes, cool. Now I'm going to set this to hmmm... 16 for a fun time, Wowzas, my gun is different from before.