Welcome Lucifor89... you name is spelled different from Devil anyway , although remember he is God's Brother.
Anyway aside from that, read here - http://www.ps3news.com/forums/ps3-he...-a-126792.html
Basically if your on OFW 4.53, you will need to have your PS3 downgraded in order to get CFW
You can do this by either hardware flashing or pay someone like racer0018 if your in the USA to do it for you.
This can't be done by just downloading files. So do some reading in the link I gave you.
As for mods etc, depends upon which you want. Ask about the mods individually and we can help.