User defined variables, and random classes?

I‌ have a question about Actionscript 3.0.

I have some experience with JavaScript, and I know that you can make JLabels, and make it to where whenever someone types something into it, it saves exactly how they wrote it.  You can then go forward, and recall this variable anytime you want.

is there a way to do this in Adobe Flash using ActionScript 3.0?  If so, how can I go about doing it?

as another question that I would love to know -- how do you make it to where you can import random, and use it.  Or would it already be imported? 

by random, I mean something where I can make pick a random variable, and then go ahead and play something based on random choice.

As an example, let's say I'm trying to make a text adventure game in Adobe Flash.  I want to make something where a player can type in their name, and then I can recall it later on in the code.

As a random, an example would be exploring in this said game.  Maybe the player chooses to explore a forest, so they do.  Do they run into a monster?  Find some loot?

I've tried to look around, but I can't seem to find anyway to do alol of this using Actionscript.  Thank you so much in advance!