Could I say "over there" rather than just "there"?
Yep, totally. But I don't know if it is accepted in the course. And Ukr also has "ось тут/он там" which mean, I think, exactly what "over here/over there" do
Not currently accepted. I reported it, but I thought I'd see if that should be considered.
It's accepted :D
Could this be translated as There is my boyfriend?
Surely that would be там мій хлопець, as in English meaning much the same thing but with a slightly different emphasis