Before you begin any paper in college, it is a good idea to outline what you want to say. This is especially important in philosophy. Philosophy papers should be clear, concise, and especially well-written. Remember, you're writing this paper for someone who analyzes arguments for a living.
All good papers begin with an introduction. The introduction catches your reader's attention and it gives an overview of what you will be discussing in your philosophy paper. It "tells them what you're going to tell them." A strong introduction gives way to a strong paper - if you stick to the point.
The structure of your paper may vary depending upon what sort of philosophy paper you are writing (history of philosophy, ethics, opinion, etc.) but the main point in outlining your paper is that you should make sure that each section of your paper relates to your thesis (main argument) and that each paragraph of your paper relates to the section it is in. The beginning of each section should contain its own introduction to the topic of that section. The end of each section should contain a mini-conclusion where you remind readers of your main point, and transition into the next section.
Finally, good papers finish strong. Papers should have a conclusion where you "tell them what you told them." Sum up your main argument, and the main supporting points for that argument. Also, leave your reader with something. A good paper is like a delicious sandwich - it contains a top slice of bread (introduction) filling (body) and a bottom slice of bread (conclusion). Nothing should go in your sandwich unless it fits the type of sandwich you are creating.