Hands? Garry's Mod

I’m so sorry about asking this question I tried searching and maybe I didn’t search it right.
Please don’t be upset about me asking this

How do you make the player model hands visible with whatever gun & whichever player model you use?

Because I have multiple player models in my point shop on my TTT and I want whichever one the player uses it shows that specific model hand.

I’m sorry ~~~ :wavey::worried:
&sorry if this is wrong section

Edit: http://wiki.garrysmod.com/page/Using_Viewmodel_Hands
I found this a while ago but I can’t figure out where to put any of it.

The ‘hands model’ or viewmodel is a separate model from the worldmodel entirely.

This wiki page has a better expatiation than I can personally deliver: http://wiki.garrysmod.com/page/Using_Viewmodel_Hands

My bad just edited and said that site was confusing. I see the codes I don’t know where to put it.
I know where the arm models are in the folders, so I know the directory to it just yeah don’t know where to put it…

[editline]24th September 2015[/editline]

player_manager.AddValidHands( "css_arctic", "models/weapons/c_arms_cstrike.mdl", 0, "00000000" )

I know this needs to be put somewhere because this is what I’m wanting. Do I put it in the pointshop lua where you set up the price etc
or do you put it else where.
Also what does it mean by, "Where ‘css_arctic’ is the name you used when calling player_manager.AddValidModel — the two numbers are respectively the skin and bodygroup values. "

~~Sorry for being dumb