Modify and opencart template

So what we have is opencart and we have already installed the PurpleTree multivendor extension.. What want is to make it in to audiobook store. We want to keep it simple so are not going to be adding many things. We are going to be removing and changing some things if possible.

The store will be for authors and the products will be digital downloads of audiobooks as zip files.

So basically we want to change anything that says "sold by" or :seller" to be displayed as author. Or when searching it should say "search by author"

We have set a basic website in wix.com just as a sample of how we would like things to look in the product pages.

The website is live now but we don't want to start working unless we make the changes.

Here are some links to the page we made in wix so you can see somewhat how we want the product pages to look.

https://www.audiobookrelease.com/migraine-survivor-audiobook

https://www.audiobookrelease.com/boys-bumps-and-blood

So we have the image up on the left, next to it a video, below that the add to cart/buy now button. PLEASE NOTE we would also like to include the Author Name. Right now in our opencart store it says "sold by" but we want to say "author"

Then we have a description of the book and some links to other sites where the audiobook can be found.

We then want to modify the "seller" " author" page to show less things. To show only about the author and more of his audiobooks.

Finally maybe some customization of the homepage with new releases and coming soon audiobooks.

This is how the product pages look now.

http://www.shopaudiobooks.com/index.php?route=product/product&product_id=50&search=your+boss+sucks+and+so+do+you

This is what shows when someone clicks on the "sellers name"

http://www.shopaudiobooks.com/index.php?route=extension/account/purpletree_multivendor/sellerstore/storeview&seller_store_id=1

I am attaching 2 images. One image of the product page with the elements 

we want to be deleted not there and the other with the seller page with the elements we dont want deleted.

That is about it. Feel free to ask any questions.

If you have any designs in mind or any ideas to propose we are open to suggestions.