There are only a few different types of LEFs. I don't know what PDK you're using or what exactly you plan to do with these LEFs. I'm assuming you want to create a LEF for your existing design. There are automated tools for this but if you want to do it manually, look for a design LEF that has 1 or more cell definitions. It stars with some LEF header info, a MACRO keyword, PIN definitions, SIZE, orientation, obstruction, etc. Do you need the LEF syntax reference?