Here is some good resources for weapons and how they are used. They talk a lot about how they were used and it might help with getting some reference on how these types of weapons are wielded. There's no guns in the images above but I've added one as it has good breakdown of how they work and has a lot of shooting ref videos which might also be of help. Also thrown an armour channel in as well, not only is if good for reference it helps me work out how the body moves and why armour is designed to help minimise restraining movement.
Hope they are some help or at least some interest, enjoy!