No disk when it tells me to select one to instal macOS High Sierra.

... when i try reinstall macOS High Sierra it tells me to select a disk, yet there isn't one to select from.

It has been my experience that you need to erase the device that contains the operating system. MrHoffman has it correct but any Mac running High Sierra would not be one incorporating Apple Silicon. The correct procedure requires following Use Disk Utility to erase an Intel-based Mac - Apple Support (emphasis added).

If you don’t see Macintosh HD in Disk Utility

... alleges the disk may have failed. That is certainly possible, but if you upgraded that Mac to a more recent macOS version then the Disk Utility version incorporated in that Mac's Recovery service will not recognize it.

The solution in that case is to be sure to select "View All Devices" in the Disk Utilities View menu or to select that option in its toolbar if it exists. Otherwise you won't be able to see the device you need to erase. Erase that device, after which you can reformat the disk, which will appear as an option for reinstalling High Sierra — which is a challenge all to itself... but you seem to have overcome it already.

You may still have some challenges to overcome, since High Sierra is rapidly becoming obsolete. In fact it's already technically obsolete, but "obsolete" ≠ "useless"

nialynn_ wrote:

would i need to go somewhere to get that professionally done?

To create, boot, and use an external SSD?

That’s your choice of course, but here’s how: Use an external SSD as your startup disk … - Apple Community

MacBook Pro 2012 internal storage is fairly easy to swap, too. The non-Retina models from 2012 use a common type of HDD or SSD and are directly accessible, while the Retina models are a little more work but are doable.

In any case, if you don’t want to, an Apple authorized service provider (though not Apple) will usually be willing to replace a failed HDD or SSD, and/or to set up external storage.

One source of parts: https://eshop.macsales.com/shop/ssd/owc/macbook-pro

Please clarify exactly which model laptop you have. You can enter the system serial number on the check coverage page here (please don't post the serial number on the forum since it is considered personal information):

Check Your Service and Support Coverage - Apple Support

I do know that Apple did have a known issue with some SSDs in the 2013 laptop models. Plus some people call a 2012 model laptop a 2013.....the MBPro 13" (mid-2012) non-Retina model is likely to have a bad hard drive and/or a bad internal hard drive SATA Cable.

Have you tried running the Apple Diagnostics to see if any hardware issues are detected? A passing diagnostic does not indicate everything is fine.

Can you explain why you’re starting an install a few days before you need this (presumably) MacBook Pro for school? Is this a Mac new to you? Did something happen that made you decide tomre-install?

What MacBook Pro? Identify your MacBook Pro model - Apple Support

Here is: How to reinstall macOS - Apple Support

If there are no disks shown, then there are no disks.

That can mean the disk has failed, or maybe the available disk was not erased and formatted as Apple Extended Journaled (HFS+) with GUID partitioning.

Use Disk Utility to erase a Mac with Apple silicon - Apple Support

If the disk may have failed, see if Apple Diagnostics shows any errors.

Use Apple Diagnostics to test your Mac - Apple Support

macOS 10.13 is very old, and will have issues with some functions. You’ll usually want to run the newest macOS your particular Mac can run.

Likely the Disk has died, get an exteral drive or SSD to install to.

MrHoffman covers it nicely.:)