Fix mistake setting up macos High Sierra

So...I somehow messed up my macbook Pro model 1502 raetina 13" Late 2013, core i5, 4GB. I wanted to clean install High Sierra. Long story short I now have a macbook with one partition, yes one, there is no base drive, there are no partitions at all. I can't seem to find anywhere to download an installable version of high sierra anywhere. Is it possible to make a boot drive from the macos that I can boot with to erase my one drive? I'm sure there is a lot I don't know nor have thought of. Also, if I can find an installable copy of macos High Sierra will it set everything up correctly? I'm new to the mac community, I'm comfortable with Windows but obviously a mac greenhorn. I greately appreciate any help you can offer.

Thanks,

Mongo549