I messed everything up

Okay, so I was trying to wipe my computer because it was constantly acting slow and such, so I decided to read a tutorial online to do it. Well, it said to erase a disk and I clicked the APPLE SSD TS128E Media one and erased it. After that I think it shut down and restartes but instead of the apple logo it was a sort of cancel sign instead. I've done a few things to fix it like internet recovery, the PRAM, and tried to reinstall macOS Sierra but nothing has worked. Whenever I try to reinstall, it says it can't. When I try to turn it on normally, the logo pops up but freezes once the bar reaches the end. Is there anything else I can do?