It is always helpful. Every good player should know and study games of World Champions

Choose the once which are similar by the pawn structures. For ex: KID-KIA

Not necessarily.

Computer programs can be very helpful. I like to compare analysis with computer program. Very tactical positions can be checked with program as well.

Follow general principles of playing any endgame position. Activation of pieces, specially King and creating passed pawns.

This is a big topic in chess and many players suffer with this issue. The best way is not to go over the calculated variations over and over. Be confident and calculate things only one time unless you feel position is very critical.

Bishops like space, open positions. Keep game open. This is the main strategy with 2 bishops advantage.

Between 10-18

As much as possible. 20-50 daily.

Depends on how hard will be work.

Many reasons why blunders happen. One of the methods to exclude blunders is to stay more focused of opponents moves and ideas.

To solve and know at least 55 mating patterns.