Uploading to live server

Hi!
I have few questions
1.)
i would like to ask for help. I have made a new design for my webpage with Elfond theme on localhost. This webpage not using any database but seen the tutorial video how to upload our work to live server via WP MigrateDB or WP MigrateDB PRO plugin. I have tried it but its not working. Also uploaded the Enfold folder to wp-contents/themes.

We have made an export of Enfold on localhost and with this wordpress on server tried to import the exported file. After import we got the message “Failed to import… Invalid post type”

Could you help me how to do this process is there any detailed tutorial?

2.)
Our old webpage is still up at the server which should be changed to WP Enfold theme after we finished work on Enfold locally. Is there any way to replace old webpage (not WordPress) to the new finished Enfold page? Or simply delete all the content via ftp and upload WP?

3.)
When we started our work the permalink stcuture was: wordpress/id:2925
I would like to change this to folder structure(the pages name to be shown instead of ID)
After we set the permalink to postname and we save it and update.After we click on the menu and the loaded page says “The page cannot be found”

Can you help with the solution?

Thank you very much!