All the time
No, only after a full stop (period). Also do not capitalise "The" and "A" in your sentence.
You do not have to capitalize fourteen hundred dollars. The only time you would capitalize any word in that phrase is when the word "fourteen" was used at the beginning of a sentence.
No, it is not necessary to capitalize "birthday card" unless it is at the beginning of a sentence or is part of a title.
do you capitalize the word protestant
No, you do not capitalize the word social worker. The only time the word social worker should be capitalized is when you are using it as a title.
It is not necessary to capitalize the word "yo".
The word "Renaissance" should be capitalized when it is used as a proper noun to refer to the specific historical period of cultural rebirth in Europe from the 14th to 17th centuries. When used in a general sense to describe a revival or renewal, it is not capitalized.
No, you do not capitalize the word drama.
Yes, you must capitalize the first word, UNLESS it is a small word, such as "It" or "A" or "The".
Unless "it's" is the first word, there is no need to capitalize.
No, you do not capitalize the second word in the complimentary closing.