Zikr & Dua

Q: Can I make dua without raising my hands, for example "Ya Allah, give me health ameen" then read durood and that's it. I have a habit of making short duas every hour or so.

Q: How can I make short duas, like if I see a beautiful car I say "Ya Allah, give me this car, aameen" then I read durood.

Q:

1. I have started reading zikr for my family. I read 100 000 first kalimah for each family member. Is this acceptable and can I change my intention to say that I am reading this zikr for that particular family member and also for every single Muslim from the Hazrat Adam Alaihis Salaam to the last Muslim to to live on earth?

2. Also, is there any related advice that you can give me?

Q: When we recite any dua then we say aameen or if someone gives us duas, e.g. he says "Allah save you from hell" then we say aameen. One of my brother says aameen and also adds "aameen bijaahi nabiyil kareem sallallahu alaihi wasallam". Is it correct? Can we add or subtract according to our own thoughts. 

Q: Is there a difference between Durood and Salaam?

Q: If we break a girls heart and she gives us a bad-dua, will that bad-dua be accepted?

Q: Is it necessary to say "La howla wala quwwata illaa billah" after "Ma sha Allah"?

Q: Is it permissible to make dua while it's forbidden to pray like at sunrise after fajr?

Q: What is the significance of reciting first kalima 70,000 times?

Q: In the Dua read at the time of the khatam of the Qur'aan Majeed, should one say "Naseetu" (with a fatha on the noon) or "Nusseetu" (with a dhamma on the noon)?