I really need help.

based on the definition here: http://www.google.com/search?hl=en&q=define%3A+adverb I think it would be "inside"..... but I'm not sure. It's sure not a very obvious one.

Come is your verb and "inside" describes where you are to go. The word inside modifies the verb come.

Inside is your answer.

God Bless You :)

Adverbs modify verbs, adjectives, and other adverbs.

Inside tells where you want the person to come, so it modifies come. That's your adverb.

please - interjection
come - verb
inside - adverb
it - pronoun
is - helping verb
raining - verb

This is a compound sentence. The comma should be a semicolon.