Hi, Andy! This is almost correct. "Call me" is the correct expression, but we need to separate these into two sentences; otherwise, what we have is a run-on sentence (运行句). Thus, what you're trying to say should read: "My name is Zhang Ande (张安德, right?). You can call me Andy." If you want to express this in one sentence, you'll need a conjunction (连词) after the comma: "My name is Zhang Ande, but you can call me Andy." I hope my answer helped. Please let me know if you have any questions.

This is absolutely correct. you don't need to worry.

yes off course you can say my name is zhang ande but you can call me andy its better to add but but anyway if you didn't its correct too