Wear winter running clothes. Also a swimming suit is recommended under if you do not want to run half the competition in wet clothes. You should wear gloves to prevent the ropes burns and the ice cutting your hand. read more here: gear and clothing
Yes, but there will be a penalty that will definitely slow down more than doing an obstacle or even attempting. In the Warrior squad mostly all obstacles must be completed successfully. In a team competition, any member of the team can help or and in some obstacles it is enough that one team member does it. For Challenge Squad obstacles are optional and there are no penalties.
The route is marked well in the forest. If you find that no one has gone here yet and you are not the first competitor, turn back your own steps and go back to the previous obstacle. Even if you are the first one you should see route tapes.
Before the race there is a mandatory competitor info the duration is 30 min. Here we go through security issues and everyone must attend. For teams is enough if one has participated in this. All participant will get info about he schedule by email