How make GST and Import Duty Payment

[Mankane1984]

I am first time try importing any item

i wish to buy Beretta M84 air soft gun for my personal target practice
from http://airsoft.tiger111hk.com
but now recently from the 1st july 2017 GST make applicable

i have no idea which type taxes to paying to Gov. and how to make payment
means any Government body working for collection of GST or Import Duty

if anyone after 1st July 2017 Purchase from the E-commerce website Plz Guide me

Thanking you