SATA Help!!!!!

Hello
I’ve purchased a new SATA hard drive since the old one that I had was now a victim of my brother’s son viedeogaming.
I boght this new hard drive just to find out that it wasn’t compatible with my computer.
The next thing I did was to buy a sata pci controller without knowing much about it. NOW…I don’t know if this thing is actually going to work if I don’t jave any other hard drives.
What am I supposed to do now???