Conversation so far:
where is the abstract placed within the paper
The abstract should be placed at the beginning of your paper (right after the title page), you will write the abstract last after you have completed a final draft.
why is abstract important in a paper
This overview serves as a summary of what your paper contains, so it should succinctly and accurately represent what your paper is about and what the reader expects.

Question: how long should an abtract be
Self-contained rewrite: how long should an abtract be for a paper