Since you are installing on new hardware, you can try with latest version of ESXI 6.5. Make Sure you downloaded HPE customized image which have drivers specifically for HP servers.
A step by step guide to install ESXI 6.5 : https://www.experts-exchange.com/articles/28863/HOW-TO-Install-and-Configure-VMware-vSphere-Hypervisor-6-5-ESXi-6-5.html
Download HPE Custom Image for ESXi 6.5 Install CD : Download VMware vSphere
Before installing this, read the information you are looking for : Installing ESXi on a supported USB flash drive or SD flash card (2004784) | VMware KB