weapon development questions

um hi i have a few questions for anyone that can answer them. i am pretty new to modding so i dont know a lot. 

um first question: i have made a few weapons that i have made and i wanna know if those weapons had skins them and i transfer them over to zmodeler to convert them to iv, how can i keep the default skins on the weapons that i have put there and still make them able to be used in iv without any problems.

next: do i need to animate these weapons for them to properly work in iv?

last: when i convert them what format do i need to put them in?

btw these are the topics for the weapons:

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