Depending on the OS these ran, you may need a DVD for the reinstall. The issue is internet recovery was not standard until 2011. If you had it running 10.6-~10.8, there is no internet recovery. However, 10.10-10.13 installations did enable it after the firmware upgrades were moved from installers to the OS updates. CAUTION: YOU NEED A SATA III SSD WITH A SATA II FALLBACK, MINIMUM - THE MCP89 DOES NOT SUPPORT SATA III!
To see if yours is one of the DVD required units (or if you can use internet recovery), press Command+Option+R - the Option key is important as it forces internet recovery. Once you do that if you see a globe, you’re set to use internet recovery. If not you'll need to install this EFI update.
If not, download a copy of 10.8 and then install High Sierra, and enable internet recovery :-). If you wanted to as well, you can always make a USB boot drive and install that way. While yes you can directly download 10.13 and get there immediately, you may have to install a older OS to bump it up to being able to use internet recovery.
Once you do that, format it as HFS Extended (Journaled) in Disk Utility, and then you’re good to reinstall. You do not need to enable WiFi anymore once you have MacOS reinstalled.
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What is the make and model of the SSD you are installing?
von Dan