There are different ways to carry out this type of letter depending on which country you're in.
Your personal address should be located at the top right corner of the page.
Example:
Addressee:
The addressee or receiver's address is usually located on the front of the envelope. You can, however, also choose to place it at the top left of the letter, just below your own address.
Example:
(Do not forget that in English, the months are spelled with capital letters.)
Example:
How do you address someone in English?
Examples:
This heavily depends on how well you know the person in question. You could simply say: "Hi Richard," but it is always safer to just say "Dear Richard," (Never forget the comma!)
Your opening should be casual, and not as stiff as they would be in business letters.
Examples:
The contents of your letter should be written in a personal and friendly tone. A good way of assessing how you should write is to think about how you would interact with each other in real life.
a) In the first paragraph of your body, you should state your reason for writing.
b) In the second and following paragraphs, expand on what you mentioned in the first paragraph.
c) In the final paragraphs, you can make some concluding remarks.
Closing sentences examples:
In terms of signing off, the choice is yours and you have a lot of freedom here. Here are some examples:
EXAMPLE
Reference: