Help about motors

[luanrookie]

Good evening, I have some doubts about motors, is my second year as a member and I was researching how the teams select the right motor for every situation, this year when our shooter did not think the possibility of using other motors out instead of cim but there teams that made with other motors and have better results, as I discover the qualities of an motors? I found a list in my research:
http://www.usfirst.org/sites/default...nformation.pdf

but I do not really know about these items I know about rpm and torque but how can this help me decide on a motor in certain situations, there is a pattern as a kind of calculation or something that will help me in my research?