a.m. and p.m. is correct
http://www.cmu.edu/styleguide/capitalization.html#ampm
No, there is no need to capitalise fitness in a sentence.
No, you do not need to capitalise mile in a sentence.
No, you do not need to capitalise ornaments.
in The King ***
No. When simply referring to a podiatrist, there is no need to capitalise it. It would be capitalised if it was part of a title on a sign, such as "T.M.Smith, Podiatrist".
Yes
yes
No. It's not necessary.
No.
No.
No, you do not need to capitalise internships in a sentence.
You do, because they are proper nouns.