First, login to your account: click here.
For your API Key, click on your name at the top right, click Account. Now, click Extras > API Keys, then click the Create A Key button and name your API Key as your want.
For your List ID, click on Audience in the menu, if you have no list created, create one and click Settings > Audience name and defaults. From here, you will see your Audience ID in red.
Audience ID = List ID (old school)
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