上/うえ

Question 1

上(で)

Answer 1

“Only after A, do/will do B”. A is a preparation to do B.

た形　+　上(で)
名の　+　上(で)

Question 2

上(に)

Answer 2

“As well”. Used for positive and positive, or negative and negative. Second one is even better, not same level.

普通形(ナ形/な　名/の　である)　+　上に