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Yes, that is the board for Prusa i3. So you want help with Marlin. I think if you say what kind of help you need someone here may be able to help you. I can't help with that. I just followed the instructions in the configuration manual for my computer and I have not revisited the Marlin software I downloaded. However, I may in the future because my LCD is not functioning properly. It says there is an SD card in the slot on the first screen, but the next screen says there is no card. Having to print with the printer connected to my computer is annoying, but at least I have worked through my other issues with the printer and am printing stuff now.
Here is a thread on Reprap that covers the card issue -http://forums.reprap.org/read.php?146,238858. I plan to try some of the suggestions, starting with getting another SD card and formatting it differently.