The number 1 "uno" becomes "un" when it goes before a noun. E.g. "Ho un fratello", I have a brother.
In Italian we use the verb "to have" for age. So, we say "Ho dieci anni" to say how old we are, even though it means literally "I have ten years".
In Italian we don't say "My name is", we say "Mi chiamo", I am called.