How to differentiate among Thou, You and Ye if used on sentence and on paraphrasing them?

Which one more polite, polite and less?

How to spell Thou and Ye in correct way?

Please help!

Thank you very much before

The English language continuously changes. Some words have disappeared or hardly been used in Modern English era. “Thou” and “ye”, and now even “shall” are among them. Unless you study English literature, you should put your priority and efforts in improving what will be required today, such as in finding a job, in getting a scholarship, or in making personal communications, etc.
Since you asked, however, “thou” is a subject pronoun for singular second person. Its object pronoun is “thee”. Now, the word used to replace “thou” and “thee” is “you”. “Ye” is a subject pronoun for plural second person. Its object pronoun is “you”. Now, the word used to replace “ye” is “you”, while its object pronoun remains the same, “you”. These pronouns can be seen more clearly in the following image. (please, click the image to view its full size!)

Their uses can be read in the following link:Thou.