Repetier Firmware

Hello, I am new to 3D printing. I recently have purchased Geeetech Pro C dual extruder. It came with Marlin firmware pre-loaded. I am in need to use Repetier Firmware instead. But was not sure which options should I select for some features, to generate one for my printer from here. So, I was wondering if anyone already have the firmware and can share with me. Thanks.
Board: GT2560+Arduino Mega,

Edited 1 time(s). Last edit at 03/25/2016 06:05PM by khondoke.

we were all new once marlin is the firmware already installed a good thing but you also need Repetier the software that links the firmware (Marlin) to computer (Linux,Mac or Windows) and your slicing G code generator (Slic3r or eq) to the printer. When you install Repetier Host if has the slicer with it but is a separate program you can upgrade or change if desired. The Repetier reads the EEprom from the printer board ie Marlin

my mistake repetier is a firmware as well as a host they have a configuration tool on their web site to download the firmware and a separate configuration file for updates the site pretty much does it all for you the firmware configuration tool is the best bet