Access 10 formatting questions

I am trying to build a basic tool to enter new messenger requests. Everything is going along pretty smooth, but I am having trouble with a few parts.

I have the following tables so far:
Employees
Addresses
Client Matter
Messenger Requests
POD Information
Messenger Services

I am building the form so that the client can make their own requests. My goal is to publish it on the intranet, but that's down the road a bit. I'll take any advice I can on it though.

I would like to make it as easy and user friendly as possible, so I would like to start off by having the client enter their attorney id number and that will auto populate their first, last and phone. I would like to also default the pickup location to be our office (or use a yes/no box above the pickup or deliver to section to auto populate our office address with their client info). I would like to be able to have it set up to filter everything according to that client's recent requests when they enter their attorney id (addresses and client matter). Both address and client matter are combo boxes based on their respective tables.

Question #1: Auto populating the remaining address information when using the combobox to select a company/residence. How do I get the form to auto populate the address fields based off the dropdown of saved company/residence?

Question #2: Using a yes/no box to save new addresses in the address table. I have the box setup and barely breathing, but how do I map it to the address table to auto update?

Unsure if it matters, but I built the form based off the Messenger Request table which basically contains all requests and info. Do I need to rebuild the "save address" section from the address table or will it work this way?