Yes.
Yes. The field goal unit in football is considered part of the special teams.
A goal-keeper defends their own teams goal not the opposition's !
Just like you have players that play on offense, players that play on defense, Special Teams are the players that play on kicking plays (for example kicking a field goal or punting the ball and also for kickoffs and kickoff returns).
100 yards
Yes, the defense can return a missed field goal for a touchdown. However, the touchdown would be credited to the special teams and not to the defense since a field goal is considered a special teams play. The TD would be considered under the heading 'return of a missed field goal' and not a blocked kick nor punt return.
to defend your goal and to score on the other teams goal
The Goal Defence starts in the oppsite teams goal third, behind the line separating the goal third from the center third. They can go in the opposite teams goal circle, goal third and the center third, but have to stop before they get into their own teams goal third.
Wing attack helps to take the ball down to their teams goal, they also help to fed the ball in to the D for the shoot or goal attack to catch.
Anyone can kick a field goal.
I heard that most of the teams will have right goal horns (but not all the teams will)
The goal keepers qualities are to keep the other teams ball from coming into the goal.
No. This would be considered a special teams TD similar to a kickoff return for a TD or punt return for a TD.