These apps paralells and fusion and virtualbox, are they in Mac App Store? And when I have the app installed what then, now it ain't only bootcamp what shall I do now to install windows 8?
Parallels, Fusion, and VirtualBox are available from their respective sites. Read their installation instructions which explain how to install Windows.
Now I have seen all these apps, but they cost money, aren't there any that is free?
Clean your glasses, VirtualBox is free.