Welcome

from what i can rember when i bought a new fiesta a few years ago i think i was recomended to keep it below 4500rpm and to not stress the engine (ie put it in 5th and try to accelerate up a hill from 20mph) for the first 1000 miles. As for the the mark so long as its just a skuff and hasn't scratched the paint just some normal car polish should buff it out.