You might have a heading "Introduction." That's OK because an introduction just presents your topic and argument and maybe some background information. Even though intros can be set up in different ways, it's pretty self-explanatory what they do.
Maybe even "Conclusion" if you can't think of a better description for what your conclusion adds to what was previously said.
But please, please do not use "Body" as a heading in your outline. Be specific about what each section in the body will be about. The body will be most of your paper and should be given more than one roman numeral section.
Double-space it, or, if some of your headings are more than one line of text, you might single-space them but put a space between each heading.
I would use the title of your paper as the title. You can state in the top corner under your name, professor/class, and date that it is your research paper outline if you want, but put the title of your paper top and center over your outline. You might change your title, and that's OK, but it will help to give your teacher an immediate clue as to what your paper is about.
Otherwise, don't sweat the details, just concentrate on the structure of your argument.