Big subject with many options depending how deep your wallet is.and how much you want to tinker, and being a self-proclaimed noob, not much I would suspect; at least for now.
Plan 1, Keep it simple, and get a drive for each machine. Back up each from the specific PCs.
Plan 2, Look into a WD NAS connected to the home network with enough capacity to back up each PC on drives in NAS. Added benefit, both PCs can access some of same data – depending upon how you set things up, the data on each and what you want to access data with. All this equals more time, more money and more tinkering.
You need to let us all know some more details of what your data is, and how you want to access it. MANY people opt for Plan 2 because they want to be able to access their data from anywhere; data such as media files, work files, etc.
So. put on your thinking cap, look into the various devices at wdc.com for ideas.