Trasnfering Wordpress Database

I'm incredibly frustrated at the moment so if I miss any details please let me know and I'll fill them in asap.

I just switched my hosting provider to godaddy. I have several websites with wordpress databases that I now need to transfer to this new host.

With my previous host, I had someone else managing it all for me so this is my first experience flying solo.

When I was signing up with godaddy I also bought a new domain. The domain was automatically added to the server. I think anything I want to put for that site is in the root directory (/).

I added another domain(bought with different provider, set the dns) through godaddys user interface. I think this is in /second-domain, and anything I want to add for that site goes in here.

So as the domain I registered was for an entirely new site I was able to installed a fresh wordpress on that easily with godaddy. However the second domain I added is for a website which I'm transferring from my previous host. With that in mind, I follow the steps on this page exactly: https://flippa.com/help/transfer-a-wordpress-site

However, I'm getting a 403 error:
"You don't have permission to access / on this server. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request."


Ok, so now here's what I think could be the cause of the problem:

Potential Problem One:
Based on the steps in the link above, when I uploaded the site content I uploaded it to /second-domain. However I uploaded it here in a compressed file and when I extracted, it had /second-domain/extracted-content. As the domain points (I think) to the /second-domain directory I'm not sure if it matters that all my website content is within another folder which is inside the /second-domain directory. I did however change the upload path in the wp_options table(?) to the correct path(second-domain/extracted-content/wp-content/uploads).

Thoughts?

Potential Problem Two:
This one is a bit simpler I think. When editing the wp_config file before uploading, I'm not 100% sure I put in the correct information. The name, username and password are definitely all fine but the "hostname" I'm not sure of. I put in the "Server" listed in the phpMyAdmin options within the godaddy UI. It was pretty long compared to the last one though. It's structured like "username.db.numerics.hostedresource.com". Maybe that's just the way godaddy do it though.

Lastly, I just realised now that in step 15 (link above) I didn't upload to "/public_html" as they show in the screenshot. Not sure if this matters.



I would really appreciate any help anyone can offer. I'm sure it's actually a simple and straightforward enough process, but I've been struggling. I've tried several different ways of importing the database so far and I've been unsuccessful then finally found the what I thought was comprehensive guide from flippa and still have had no luck.

Really would appreciate any advice or thoughts,
Thanks a lot,
Jason