Acting : Cover letter for agents and representation by Cristina Massaro

Hello good people! I'm not sure if this topic has been brought up before but I'm going to ask anyway. Hope would you apologies me for my lack of knowledge. My point is: how can I get a well written cover letter to send through agents and agency all over the UK? As I'm not native English speaker I may get easily in trouble with this issue. Well, any suggestion will be deeply appreciated. All the best Cristina