How to deploy a word web addin

Hi, my company ask me to build a Word Web AddIn which I tested it in on Office 2019 installed locally on the machine of my collegue by using the sidelocal approach. So I created a network shared folder where I did put the manifest and I did publish the html application on IIS reachable via https.

Now is time to deploy the addin to make it public and my asks are:

Can I use AppSource to deploy it to ? I have to pay for this ? if yes how are the cost ?

Can I use MS. Marketplace to deploy it to ?  I have to pay for this ? if yes how are the cost ?

There are other ways to make the addin public to be downloaded and used in word ? 

Can I create an installation program which can be downloaded from the user to install the addin ?

Last: if I have to use the marketplaces which one is better AppSOurce or Ms Marketplace ?

Thank you in advance

Best Regards

Giovanni