Open Office is the open source version of MS word. It is free and can do all the things you'll ever need. 

For PDF open Open Office first. In the menu click open file  and click on the PDF file you want to edit.

You can import MS Word documents as well.

Use the export function to create PDF file formates from text documents.

Use the export function to create all kinds of file formates from PDF such as:

HTML

XHTMT

PDF Portable Document Format

SWF Macromedia Flash

BMP windows Bitmap

EMF

EPS

GIF    Graphics Interchange Format

JPEG Joint Photographic Expert Group

MET

PBM

PCT

PGM

PNG

PPM

RAS

SVG

SVM

TIFF Tagged Image File Format

WMF

XPM