I have flown in and through Indo on many occasions but not for a few years now. Every bit of advice offered so far is good stuff, all of it.
every airport in info is a bit different with some local ‘rules’ applicable so get local advice when ever possible. The aviation community is friendly and helpful. There is a lot of clouds there every day and some have very big high rocks in them. Be aware. ATC will not necessarily vector you around them, that’s your responsibility.
get all ducks in a row, take more USD than you can ever conceive needing, make sure it is fresh, clean unmarked no creased corners.
have fun it’s a beautiful place.
HD2