I want to draw a data flow diagram for a shoe store.It's a small shop where only 2 to 3 employees are working.I want the context diagram, level 0, level 1, use case,class diagram,sequence diagram etc.So can anyone help me to do this accurately.The drawing must not be simple.It must be accurate and all the necessary things must be included in it.I mean the system must go into the deep.

The data flow diagrams are graphical or pictorial representation of the Billing Management System of the shoe store. The data flow diagram covers all processes and data storage area, which takes place during any transaction in the system. Data flow diagrams are functionally divided into context level, zero level, and first-level data flow diagrams.