correct, you need to follow the link I sent earlier The form objects in the designer will not work with  your use case

https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/developer-reference/form-bridge-apis

https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/developer-reference/form-bridge-apis

You will have to setup reverse proxy with the web server similar to embedding Adaltive Form in extern web page 

Approach 1 is betterfor custom fonts refers to. Question 7 in this FAQs https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/html5-forms/faq

Drag and drop a new component and try again 

If your pdf was originally created from word then the conversation from PDF to docs will give you better results 

You will have to remove the password. If you don’t know the password, there is nothing you can do

https://experienceleague.adobe.com/en/docs/experience-manager-learn/forms/document-services/render-interactive-form-using-apithis gives sample assetsyou can download and deploy them on your server to test the capabilities 

I have a tutorial on thiswill send you the link once I get to office