Dear all, I'm new to Fluent and never use the software before . Can someone direct / guide me on the software ? Is it like Matlab that you need to write the command so that the simulation wil start ?

Fluent is much easier software than Matlab if and only if you can appreciate the physics of the flow problem you are dealing with. Get the software installed and go through help and tutorials. It won't take you long to actually start working on your problem.