Where do you set the chains?

[FredFan7]

Here is an offseason situation.

NFHS Rules:

3rd and 5 from the B 10 yard line. A33 runs to the B 6 yard line. B77 commits a dead-ball personal foul late hit. A33 then curses and shoves B77 drawing a USC. We walk off the late hit to the B 3 yard line awarding a first down to A, then walk the 15 yards back to the B 18 yard line.

Is it first and goal or first and 10 from the 18 yard line?