which pair is good for you , it depends on your trading condition , if love doing scalping should choose the broker which allows trading
the demo account is really important but the main problem is when we try to apply this experience actually not works in a real account.
I think you can try micro lot accounts for this purpise, like HFM micro where you can start from 10 USD and get an account where you will experience all real market conditions at almost zero cost.
micro account is very supportive for the traders who are beginners above all to acquire all basic knowledge and experience.
psychology of school from pips school + trading in a demo account = the best result for the beginners level.