Answers

$800

Consider what the tree is worth compared to similar trees around it. Sometimes it's best to cut down and eliminate disease spreading...

Water until established and then cut the water back.  Bermuda needs water, but not as much as some of the other types of grass.  Keep it cut short

Blow in, but will have to hide it with a new ceiling I believe...

sounds like too much water.  Pine straw has acidity in it and helps transfer the nutrients properly to acid loving plants.  Fertilizer could also be needed.  Plant nutrient deficiencies vary and sometimes the necrosis in the leaves can identify the issue or which nutrient is lacking...