Yes. Admiral Markets is a top broker and scored highly in the Trade the Day broker reviews.
The AvaTrade welcome bonus amount depends on your deposit amount. Using the partner code "128979" will get you the maximum welcome bonus available when depositing to your new account.
Retry logging into your MT4 account, it's possible you made a typo on your account number (username) or password.
How long does it take to withdraw from Pepperstone?