If you are required to write an abstract in your research report, it is probably to focus your writing and your reporting. The abstract is summation of what the paper intends to do and an evaluation of how well it covered it.
If you have access to databases (perhaps through a library or university) such as Academic Search Premier, you might read those abstracts to articles to see how they are laid out. Generally, abstracts are not very long.
Check with your instructor to see what they expect in an abstract. An abstract is sometimes required, but often they are not. The most important thing is to know what your teacher expects.