today i attended an interview. The employer told me that I should know some skills about the job. Today I am going to start to work on those skills. Now, I am writing a "thank you for the interview" letter to him. I want him to know that I just started to work on those skills. It's like, "You mentioned that you need an assistant who has strong drafting discovery/letter skills. I have already started working on it/I have already started to work on it." Which one is correct? Thank you.