hey guys i hope that this is the right place to post.

is it normal that when i step on the guitar cord i hear it on the amp?
yes, it could be from the chord pulling on the instrument. put the cable through the guitar strap that way if you accidently step on the cable, it wont unplug from the guitar. also, try not to step on the cable as this can ruin it.
Actually, it just means you have a bad/cheap cable. Better cable = less "noise".
Should be no problem really, as long as you dont keep walking on it just for fun =)