Will this be overkill or otherwise not recommended for someone who is new and just starting to learn?
My goal is to have something I can grow into, but initially I'd like to host a few VMs, game servers, and a have place to store content. I'd also like to host a PLEX server in the future as well but might buy a separate piece of hardware for it specifically down the road. Thanks in advance for taking the time to help a newbie!
In all honesty, you should look for something in the R730 series, get a small formfactor machine so you can fit sata/Sas SSDs. It also has better processor support (v4 series Xeons) and DDR 4 support. I think that the x30 series are the first dell servers to support PCIE bifurcation which makes it super easy to add NVME drives via a PCIe card.