How do I attach armor/weapon to my animation?

I’m a game developer and newbie at 3D modelling.
To animate my characters, I’ve been splitting body parts into different models, and joining them back in-code (with rotate, translate).
However, my animations are too simple, so I’m trying to change to Blender animations.
But how can I attach a weapon to a character’s hand if I do not know where is the hand?
Am I supposed to have one animation to each combination of action, armor, weapon?
Or is there an easier way?
Sorry if this isn’t the right forum, I couldn’t find any better.

I just answered you duplicate thread - as you are a new member you must wait for your posts to be moderated, this can take some time depending on what the moderators are getting up to…

After 10 good posts, no bad language, etc. you will be off moderation and your post will appear instantly.

Cheers, Clock.