civil 3d- Contours

I’m new to civil3d and I need my question to be solved step by step.

1) I have to do contour for my surface but there’re two ways and I’m not sure which one to use- first way (right click o surface- edit surface- display and there is major and minor contour to turn on)- the other way under breakline there’s and an option called contour when you click on it says to add (not really sure what to add). hence which one to use in order to have the right contour for the surface

2) please see attach pic.. why there’s perpendicular small lines to the lines. why there are alot of lines stuck together at the corners not sure how to fix it.