I'm like you, easy at first is good, you can build on that in time.
What style of wine are you planning? (Cabernet Sauvignon, Syrah, Merlot, Pinot Noir are top sellers(Syrah is the term for Shiraz for grapes not grown in a specific region in Australia) of course these are all red grape juice). The pail juice that I have purchased in the past came from a company called Alexander and sons in Acampo CA. Today, I purchase California grapes by cases and crush them but after 20 years I have all the hardware.
As for blending, the only time I do it is when I have 2 partial gallon jugs and I don't want them to oxidize, so I unscientifically mix the two - I have friends that do blend direct from grape stages and have a proven recipe. If I were to blend, I believe I would start by investicating acid levels, like peppers require PH level soils to produce the best flavour peppers true to their origin, wine depends on acid levels.
I would recommend, that when you start you wine purchase some oak wood chips. This is added approximately 2 weeks to your secondary fermentation before bottling, a couple of handfuls to the wine, then remove before bottling. If you want, split the wine into 2 separate batches, one without chips the other with. Purchased bottled wine is aged in oak barrels before bottling, if you want any added flavour or aroma this would give that appearance.
Have fun.