Finding adresses for weapons + attachments

I figured i want to start making trainers myself, such as attachment trainers, and maybe also xp trainers, but how the hell do people find adresses?
I remember when i made adventurequest trainers and simple trainers like that, which you just had to search for a value which was already on screen, so i dont really know how people find adresses for the weapons in BO2, aswell as attachments + perks. If anyone know how, please do tell me.

I've already tried searching the forums + the web and youtube, no luck.

Search for your class name, for example "Custom Class 1", right click on the result that CE will give and click on "Browse Memory". Then switch an attachment on the weapon of that class in-game; when you do that, on CE an address will turn into red briefly. That's the attachment offset for that class. Same thing for Camos and shit like that.