The first step to......  An effective email is to start writing with titles like Dear Dr. Blake/ Dear professor Nash 
Try not to use words like hi, hello etc 

The second step is to write a good introduction write down ..... You're writing this email like I'm writing regarding/ The reason I'm writing this email is to 

The third step is to give more details of your writing mention your request and ask them ..... 

In the fourth step write a good conclusion by giving a general overview and summary of what you want.....and finish your email by saying I'm looking forward your answer 

Finally......phrases like yours sincerely, yours affectionately, best regards, best wishes etc and write down your name and signature 
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The first step to...... An effective email is to start writing with titles like Dear Dr. Blake/ Dear professor Nash Try not to use words like hi, hello etc