"Which one is right?" is more suitable first. First one is can be true but second one is usable in narrative situations. I think I used to an actress is more suitable.

I think both are essentially the same - I was an actress - I had been an actress The second example might be used more often in the context of telling a story. For example "I had been an actress, but I didn't make any money so I quit." However you will sometimes also hear people say "I was an actress, but I didn't make money so I quit." Either is acceptable.

They are both fine and correct.