Need help getting started. Hardware checks out?

i5 4670

MSI H81m-E34

8GB RAM

*R7 265 2GB

*GTX 750ti 2GB (which card?)

*GT 650 1GB

256 GB Intel SSD

I own a MBP and an iMac so I already have Sierra downloaded. I assume I need to use a 3rd party tool to make a USB bootable?