Please can someone tell about kuwait including witnesses.

Probs.
Try to avoid the Gulf country if you are not getting invitation from a legit company there.
KSA, UAE, Qatar, Kuwait and the rest of the GCC all run an oil base economy and most of their citizen work for the government, they need migrants from Philippines, Nepal, Bangladesh and African countries to do their dirty works, the girls as house maid and the guys work at construction sites under intense heat for low wages and also they operate this thing called 'Kafala System' you can research on that.
If hustling is your purpose there, please reconsider.