Setup Issues moving a WordPress site

Hello all, first post and I’m positive it won’t be my last lol. I’ve been working with WordPress for over a year as a writer on a few sites, and recently decided to setup my own and give it a go. I purchased several domain names and set sites up from scratch with little problem, but am having a hard time installing a “site” I purchased from someone on my hosting.

I was sent a backup .zip file and a sql database file and basically told to install them without much further direction. I had some issues with the nameserver and a few other things, got those worked out on my own but am still stuck on the actual install. I can get the site up, but it basically seems to install it as a new site although it loads unapproved/approved comments from his site but not his actual posts. The site itself looks nothing like it did on his end and as I’m missing content I know I’ve screwed up badly somewhere.

I’ve done all I can think of as far as making sure to change the information in the setup file, etc.. I did import the database he gave me through myphpadmin, but get an error about wp_commentmeta and something about a duplicate entry ‘1’ for key 1. Godaddy hasn’t been a ton of help, nor the seller due to a bit of a language/logic barrier and the fact that I’ve never done this before lol. Any help would be appreciated, and I apologize if I got any of the terminology wrong still learning : )