Door messages and noises and memos in scripting?

[MissMarilynn]

Many questions, haha.

1. How do I get a message that says "This door is locked, you need a key to open it" when I interact with a locked door?

2. How do I get the noise when I use a key and unlock the door? Also: How do I get the "solved a puzzle" purple light and noise of accomplishment.

3. How can I create a memo to appear after interacting with a locked door? For instance, if I walk up to a door and it's locked I want the memo writing noise to sound and the little diary to light up and a little hint will be written in the journal.

If you can only answer one please do! I need all the help I can get.

Another random question: How can I get a rain sound to continually loop in the background?

Thanks!