PE 2650 Server Maintenance

since I’m very green with Server administration maybe someone can clarify a few things for me

-question:In what order do i upgrade the following on a Dell PE 2650 Server (BIOS, ESM, PERC and SCSI Drives)and most importantly why?

We happen to have 2 old test servers in the lab that i’ll like to play around with. My plan is to develop my skillset.

I figured once i know how to perform a manual update of the above items etc I can then go on to learn how to automate the process via OMSA

thx