Letter Writing - FULL Format - Situation 1 - from individual writer to an organisation

SITUATION 1

Let us pretend that you are writing from home.  Your address is:  Block 221,  Bedok North Street 5, #05-123, Singapore 123456.

If you are a private individual writing to an organisation, then please understand that you are writing from HOME most of the time, so your SENDER'S BLOCK and RECIPIENT'S BLOCK should be: 

[Never Write Your Name Here, just the address!]
Block 221  Bedok North Street 5
#05-123
Singapore 123456

11 July 2010

The Director [Always state for whom. If no name, then the position will do!]
St. Patricks' Children's Home
2 Victory Road
Singapore 678910

Dear Sir or Madam

My Contribution to Charity Walk [A noun phrase - relevant / short / clear]

.  Paragraph 1
.  Paragraph 2
.  Paragraph 3
.  Paragraph 4
.  Paragraph 5
.  or even Paragraph 6

Yours faithfully [You did not know the name of your recipient.]

YOUR SIGNATURE
Wong She Woh [Your name is written here.]
Donor - Charity Walk [You may want to make clear your relevance here.]