how can i solve this with method of section

For each of the following beams, use the method of sections to express the normal force, shear

force and moment as functions in terms of $x,$ and then draw NFD$,$ SFD and BMD$.$ Show all

values and units on the diagrams.

The solution must follow the student's outcome $($ABET$)3-$step format: I$-$Problem Definition,

II$-$Problem Formulation and III$-$Problem Solution.

$*$ this is all the information i have $*$