Many people ask for samples of SOP letters what is not bad, but the point is that their (embassy officers) are going to look at your support documents, and not everybody's SOP letter match your profile, so what I think is that you might take a look at the letters but don't make the mistake of copy / paste all what is in the letter and submit your application just like that. Make a letter that match with your profile. Make sure you show that you truly have ties to your home country and that your intention of travel is to study.
Some of the documents that you can submit are:
-Bank statements (You and supporter(s))
-Married Certificate (if married)
- Titles and properties certificates (house, vehicle, piece of land, etc...)
That will works....
Thank you very much for your advice and information.....
Greetings and all the best!