Hire Virtual Assistant In The Philippines

Hello! I'm very new to freelance work and wanted to start putting myself out there for some work. I'm interested in doing data entry jobs/ virtual assistance. I just wanted to know if anyone could give me tips or sample cover letters for applying to data entry/ virtual assistance jobs (at the beginner level) that would be very appreciated. I don't have any work that pertains to voice over work so I can't use any as attachments or for a portfolio. I really am just a beginner to freelance work. Thank you very much for your time!