Hi guys so i just got my new (old) bike
and I want to install a belly pan and a cockpit fairing!
Now, did anyone have any tutorials on how to do that as I'm really noob and I would like to see how is done first before I actually start doing it

Thx

Welcome!   

If you purchase fairings/belly pan made for the GS500 they should come with install instructions.

For example:
http://www.whaccessories.com/GS500Accessories.htm