But most of the time, what you have is a genuinely fuzzy idea, and that's where keyword searches come in real handy.
Every library has at least one keyword-searchable index of magazines and journals, and may even have a special index that covers your subject area. Try typing in the words that come closest to your topic, and see what happens.
By the time you finish your research and writing, you might well be genuinely sick to death of your topic (ask any graduate student who's just completed a dissertation! But if you're bored when you start, you've already defeated yourself, and turned a potentially interesting assignment into yet more drudgery. If cloning is too broad for a five page paper, what about cloning Elvis?
Make sure that you find this topic genuinely interesting, or find some aspect of it that is especially cool. If your topic is way too broad, try homing in on some part of that topic, and exploring that area in more depth.
cloning of animals, unexpected social problems that might result from cloning, technical aspects of cloning, moral or religious issues related to cloning, cloning my girlfriend or boyfriend, etc.). Otherwise, those interesting related issues you delved into might end up looking like window dressing, added only to bring the paper up to its required minimum length. A good library always has a good professional staff, trained to be courteous and helpful, and bright enough to genuinely care about a LOT of topics, and who will expertly direct your search to the right place.
Profs see enough fluff that they generally smell it a mile away. Unfortunately, librarians are merely human, working long thankless hours for low pay, so a little patience on your part will go a long way.
Every system has a different "wild card" character (usually a ? Not Every Library Has Every Book Or Journal, or every issue of every journal.
Find out what sources are NOT available locally, but potentially valuable to your paper.
The rules and fees vary, and there may be photocopy fees or other restrictions.
BUT remember that these ILL transactions take lots of time.