Check monster hunter 2 for some inspiration if you need it
Big Monster Hunter fan here ^^, some would fit like the raw material ones, iron+ but the more exotic items, well I guess it would depend.
Ok, newb to modding here, how can I make these models? because I wish to make my own weapon models.
Well first you should get yourself a 3d program like 3ds Max, Maya or Blender. Blender is free and there a alot of tutorials online. 3ds Max is expensive but for me it is the way to go, personal favourite ^^". Maya is incredible powerful, but really hard to master, also it is kinda expensive.
After you`ve tinkered around a bit with these programs you should be able to create basic weapon models like the ones above, since they aren´t really complicated. Of course should you need help, you can allways drop me a note