Well "and to take the shortcut" just doesnt sound right, the rest is fine..
What do you need help with?
I believe it would be declarative because it is stating a fact.
Interrogative is a question and will allmost always end in a question marks.
Imperative is an order and will almost always end in a period.
Exclamatory shows excitement or concern ends most often with a exclamation mark.
IM HERE TO HELP??? WHAT PART DO YOU NEED