Need Help with a report - Making Diagrams

<p>I have a report due soon. I want this report to make a lasting impression on a teacher which I have been having trouble in, therefore I want to do 110% on this. I want to create my very own diagrams from scratch. This diagram I plan to do will probably be a diagram of fission, nuclear fission, and probably a diagram explaning the formula E=mc2.</p>

<p>What I need your advice in is if you know any guides that help you make diagrams... have you done something similar yourself? I know somewhat a good amount of Photoshop 7 but I am clueless when I think about diagrams...</p>

<p>Any ideas?</p>

<p>I want to be able to make diagrams like the following from scratch:
<a href="http://encarta.msn.com/media_461531023/Fission_and_Fusion.html%5B/url%5D"&gt;http://encarta.msn.com/media_461531023/Fission_and_Fusion.html&lt;/a&gt;&lt;/p>

<p>the "correct" tool to do this would probably be adobe illustrator but if I were in your situation, having to do it for a one-time project I'd put something together in Photoshop.</p>

<p>do you know of any good tutorials that can help me?</p>