How do I purchase DLC for Bioware games? Through Origin or Bioware?

I am fairly new to using Origin. I was planning on purchasing the following games:

Mass Effect trilogy
Mass Effect 3 digital deluxe upgrade edition
Dragon Age Ultimate
Dragon Age 2.

I know not all the Mass Effect 3 DLC nor the Dragon Age 2 ALC is available there.

My questions are:

If I purchase all the games above, can I purchase the DLC from Origin? Or do I go through Bioware?
If I buy the extra DLC, does it get installed through the Origin client once I decide to install the base games?
If I purchase everything before running the install and play, will the Origin client automatically install the DLC if it has to be bought via Bioware?

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Quick Answer about "How do I purchase DLC for Bioware games? Through Origin or Bioware?"

Buy BioWare points in the Origin Store.

Launch the Origin client.

Got to My Game Library.

Click on the Mass Effect 2 or Mass Effect 3 game tile.

Click on Extra Content.

Choose your DLC.

Does Origin access include DLC?

Check the DLC's or the different versions of the game in store, if they are marked with origin access, then yes. If they're not, then no. For The Sims 4 for example, digital deluxe content is included, but not any of the packs. It is very common that Origin Access has the Deluxe version of the games.

Can I buy DLC on Steam for an Origin game?

Yep! You can buy DLC both on Origin and Steam.

How do I add DLC to a game?

Installing DLC in Steam

Open up Steam and go to Library.

Select the game you want the DLC from and then click on Store Page.

Select the DLC you want to buy in the Store page, it's under Content for this game. ...

Now, click on Install content, it's in the receipt page.

How do I redeem DLC on Steam Dragon Age Origins?

You don't need the DLC key if you have one. Go to your Origin Library. Click add a game, in the drop-down menu click Redeem the product code. Enter the CD-Key from Step 3 and that should add Dragon Age Origins Ultimate Edition to your Origin account library.

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Tim Samuel, Tim Samuel, Brett Jordan, Amina Filkins