Geeetech

Hi so I just finished building my Prusa i3 Pro B (my first 3d printer) and I've run into a few issues.

My Y and Z axis move in the correct direction but my X moves in the opposite direction, and anytime I try to "home" all/any of the axes the axis/axes keep moving and don't stop. I haven't been able to print anything yet so not sure if the extruder is working properly but was hoping you guys could help me out.
The board is a GT2560.
Have not messed with the firmware yet. Not too sure of what to do with it and a bit afraid I could mess up the board if I mess with it without understanding it.

the solution is in the firmware, there are good step by step instructions
note: the last arduino environment is not the right one for complitation of this firmware, take 1.0.1

if you need to make some tests about handling arduino programmation before, an arduino uno board, 2 switches, 2 leds, 4 resistors ... is only a few € / $ / ... on ebay
the GT2560 from geeetech is in fact a re-designed specialised arduino board, type Mega2560

Thanks for the help and reply. Been busy with classes so haven't been able to mess with it this week but will probably sit down and try working with the firmware this weekend.