If the header and footer are the same why not create a template with the header and footer or create form fragment header/footer elements.  Using fragments allows you to modify them as needed and have the changes replicated automatically across forms.

What OS are you using?  Is this a JBoss turnkey install, if so the installer will install everything it needs.  If not what appserver and DB are you using? 

Did you change the translation property Translation Method from Human to Automated?  If you don't you won't see a start you'll see import/export/rename.  

If this is an Adaptive Form you can follow these instructions https://helpx.adobe.com/aem-forms/6-2/using-aem-translation-workflow-to-localize-adaptive-forms-.html

An additional license is required to use the AEM Forms add-on features.

If you're connecting to ES2 the credentials wouldn't be admin/admin.  That's the default for AEM.  For LiveCycle or AEM Forms JEE the default is administrator/password but if this is a production instance that may have been changed.

PDF Forms are not adaptive and neither are HTML5.  Adaptive Forms are.  There are differences between PDF and HTML5 renderings not from a viewing perspective but from an approach perspective for example to work offline with html5 the AEM forms app would be needed and printing needs a different appro...

It depends on your use case, if you have one or two simple forms where you want to capture 5 fields of information then the OOTB forms would suffice.  However if you have this requirement, moderately complex, and/or complex forms then AEM Forms would be a better solution.  Here are some of the detai...

WorkSpace is the user interface for people oriented forms processes.  It requires an AEM Forms JEE installation or a LiveCycle installation to be available.

This should give you the guidance you need on Page 7 https://helpx.adobe.com/pdf/aem-forms/6-2/upgrade-checklist.pdf