Your answer.........
1- How much you want to earn ? You can not expect more than 10% from your trading. So calculate this.
2- It is good to be sticky with one pair when you are a beginner. On the other hand EUR/USD pair is good for trading.
3- At least 1:2. You can increase it. such as 1:3, 1:4...
4- M1-M5. I do not support Scalping. For this reason, I do not want to say more about it.
5- I have no idea.
6- It is depend on your account balance and your risk percentage.
7- Which is suitable for you ?
8- Use your risk:reward ratio to find out this.
If you find out any mistakes of my any answer, please notify me. I will try to edit this.