I've ordered a few aromatics, but it seems many on this forum recommend starting out with English blends. I thought aromatics would be more palatable at first (and help appease my wife when she learns of my new 'hobby'). How long should I typically wait for the tobacco to dry sufficiently after opening? A few hours? Leave overnight? A Week?
Those around you will almost certainly prefer the tin note of an aromatic over an english blend, but you will hear many n00bs describe their first english blend as life-changing (for good or ill). For me, it was an amazing experience and English blends quickly became (and still are) my favorites.
Aromatics may be more palatable for you but they may not. They are often a wet, sugary, sticky mess that smell great but really it's like eating candy vs. a good meal. They can also burn quite hot with all that sugar if you aren't careful with your cadence. You will hear the sizzle when they do. I like aromatics, but you should definitely try some other tobaccos as well in the beginning. English and Va/Per in particular, IMO.
Get some Arango Balkan Supreme and give it a go.
As far as drying your tobacco it depends on how much moisture the blend has when it arrives. Sometimes it requires no dry time at all, sometimes overnight or more. A good rule of thumb for beginners would be to dry it more than you think you need to, and pack it looser than you think you need to. After that, adjust accordingly and see how the flavor/your experience changes as you do until you find your sweet spot.
To start out, try to dry it until it feels like it might crumble if you rub it together, but not quite so dry that it actually does. Then dry less with the next bowl and see how things change.
Also, if noone has told you yet, you should put the tobacco into a mason jar after you open your tin or bags. This will keep it's moisture level appropriate pretty much indefinitely and allow the tobacco to mature and blend. If you don't do this your tobacco will keep drying out and turn into dust in a pretty short time frame.