All you need to do is copy the php files that come along with the FPDF download and paste them in your php 'include' folder and refer to the package in your code.
This is a simple example.
<?php require('fpdf.php'); $pdf=new FPDF(); $pdf->AddPage(); $pdf->SetFont('Arial','B',16); $pdf->Cell(40,10,'Hello World!'); $pdf->Output(); ?>
As shown in the example above, it is relatively simple to use the library. You can find the tutorials here.
You can create some complex pdfs such as the following,
A calender : Soruce Code Demo
A tree : Source Code Demo
You can find more such samples here. I hope you guys find it useful.