I am working on how to read a datasheet for Mosfets.. I having a hard time understanding what everything means and is there any information that could to better describe the function of each line???

 

For datasheet information specific to FETs:
http://www.nxp.com/documents/application_note/AN11158.pdf
http://www.physics.unlv.edu/~bill/PHYS483/fet_datasheet.pdf

The datasheet should provide test schematics for how most of the data is collected. Anything not specified in this manner can be obtained from the manufacturer, as different companies test their chips in different ways.

For a more general reference, I find the Art of Electronics does an excellent job of explaining part constraints and characteristics. This will cover most any general component you could want information on.

 

Generally, you should concentrate on the parameters important for a particular application. Are you looking for a MOSFET for any specific purpose?