I need to buy a new computer to be Win 11 compliant and the Dell Precision 3450 has all the basic components I need except a card reader and a wifi/bluetooth 5.0. I also want to add another 8 GB of ram. 

Can I install these myself, I'm OK working inside a computer, and can I order them from Dell?

I need to know the proper Dell product numbers for a card reader and a wífi/bluetooth adapter.  Also if there is a Dell ram which it would be best to use to match the installed ram or will any quality DDR4 ram work, Corsair for example.

Thanks so much for your help.