I think I messed up by trying to do Bootcamp. Help!

So without thinking today, I tried to install Windows 7 on my system (running Sierra) with Bootcamp. Everything was going okay, it partitioned the volume, then it restarted the computer. After restart, I had the Windows boot flash drive plugged in. No dice. All I got was a black screen with a blinking cursor. I took out the flash drive and restarted. This time it gives me this message:

"Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key"

No matter which drive I select at boot, it gives me the same message. I have tried troubleshooting and searching for answers online with no luck. So I want to reach out to y'all. Is this an easy fix and I'm missing something? I'd appreciate a hand because I'm getting frustrated with this same screen! Thanks!

submitted by /u/123comicbro
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