New to Bethesda engine modding, need help making a custom follower

[Sankese]

Hello!

I am wondering how to create a fully-voiced custom follower in Skyrim SE.

I have his .fbx for his head, and his .fbx for his body which are both already rigged.

I have put him into VRChat, DMC5, and MMD. I really want him to be my Skyrim follower, but I am completely 100% new to modding Bethesda engine games.

If someone could give me a guide to make a completely custom body-head follower, thank you!

Please help me D:
Thank you for your time,

Sankese :D

ps i have attached what he looks like below.