"I know this is just your way." - It has two meanings for me: I know that only you do it like this or this is your destiny. "I'm not good for much." - I can't be useful in many ways, only in the limited ones. "I'll be hanged if I will. - It probably means: If I really want this I will be severely punished for this.

I guess it means, that there were not so many things that the hero could still touch (solid) and that was real and the wall was one of this few things.

Cengiz , In the first sentence, it's nominative case, masculine, singular. It means that "there is experience" you can check yourself and say: У етого автора большой опыт - У этого автора ЕСТЬ большой опыт". The second sentence is genitive, masculine and singular. In Russian we almost never put the verb "to be" in the sentence like this. The third sentence is a feminine noun in the genitive case. It's correct and the ending must be "и". The fourth sentence is like this because of the verb вижу. The particle "не" works as a negation. Without не it would be "Я вижу нашего ученика". Itäs masculine, genitive.

Here we have a sequence of events and actions. First, he tried to stop and after he crashed the wall.

If you'd like to use "experience in" I would say: "I have experience in working as a hotel receptionist"

Под вокзалом can have only two meanings. To work physically under it. Or sometimes we say in Russian "to work under someone/something" what means in English to work for.