Do not be afraid to use parts of quotations rather than whole sentences, or to introduce quotations in the middle or at the end as well as at the beginning. Re-work awkwardly worded sentences. It is a semi-formal writing style inappropriate for professional writers. You may use any fragment of a quotation without them at the front and back because the lack of a capitalized first word announces its incompleteness. In anything shorter than a book, a bibliography is unnecessary.
Footnotes are sufficient.
Always use citations. A general rule is that if you can find the fact in three or more sources it is considered an established fact an need not be supported by citation. However, when in doubt, err on the side of caution. Anytime you use a quotation you must provide the name of the author and your source. Anytime you borrow an idea or a mode of expression from an author you must provide both the name of the author and the source in which you found the expression.