@Naweed Bro we planned for minimarg and booked a room through some contacts in army in 2015.. but when we reached chillum chowki we came to know that our dreams to visit minimarg, rainbow lake, Chota deosai, Domail etc got shattered because.. our booking got cancelled.. as some general of army landed there with family. And by the way.. these days its quite difficult to visit minimarg due to border situations.. may be conditions will get better..
If you have any contacts in army (higher rank is better option).. just ask them to do you a favor..
Its a jeep track you can park your ride in chillum chowki head quarters.. if allowed to travel on army's 4x4 vehicle or may be there are local jeeps available.. other option is.. if allowed.. you can park your car in astore and hire jeep
Many people here have been to minimarg.. im sure they'll guide you about routes and places in minimarg..