Are there any minecraft servers tha give you free creative to get ready for PvP?

No that i know of. Most servers just give you lots of stuff

While I can't say there aren't (there are too many servers out there for anyone to know them all) I would be very surprised if there were.

Why? Because if you gave me creative mode for 30 seconds in a PvP setting the first thing I would do was give myself full diamond armor and a diamond sword. Other people I know would plant TnT, a lot of TnT, around an area and the break out a tripwire. Still others would grab the entire selection of potions.

Creative mode is simply too powerful.