About open source licenses and third-party in general

Hi guys,

I’m currently making the installer of my first commercial product. I’ve planned to start selling it at the beginning of the next year. The plugin will be available as AU, VST3, AAX, Standalone (with ASIO support on Windows), and will include some open source libraries.
I would like to check with you if I’m doing everything in the right way.

AU: do I need to do something in order to sell an AU plugin?
VST3: I’ve downloaded and filled out the license agreement, I will send it to Steinberg as soon as my new company will be active
ASIO: I’ve downloaded and filled out the license agreement, I will send it to Steinberg as soon as my new company will be active
AAX: as soon as my new company will be active I will ask for the SDK to AVID through their online portal

Regarding the open source libraries:
JUCE: I’ll buy a license
Third party library: this library is under BSD, and includes an MPL2 library and a MIT library. I’ve copied their licenses inside the EULA I’ve written for my installer, do I need to do anything else? All these libraries are unmodified, I just compile them in my project.

Am I missing something that I need to do in order to sell an audio plugin?
Thank you for your support.