Don't know how to get an icon that will open the program

I've just downloaded openoffice but have no idea what to do now. Had it on computer but computer crashed, now I have to start over & don't have a how-to person to guide me. I used to have an icon for openoffice but don't know how to get one back, etc.
Stuck dead in water. The document files I need are still here but I can't open them!