I like those varieties as well. I find them both to be strong growers. Root Beer is red during the spring and fall and the color of root beer during the summer. The backs of the leaves on Cinnamon Curls and Mahogany are rosy pink, which adds a lot to their color. Mahogany is a much richer shade of red (think true mahogany wood) than Cinnamon Curls. It looks like the new growth on CC is bright red fading to a brownish red, while Mahogany keeps pretty much the same rich color all year long. Mahogany's leaves also have a slight sheen to them, while CC's are matte. You didn't mention how much sun these will be getting. The amount of sun and heat the plants are exposed to can change the color drastically. The varieties that I plant in full sun get a lot greener than the ones I have growing in shade. Also, the ones that are in muggy shade get a lot greener than the ones in cool shade. This is during the summer months, of course. Everything's bright in the spring. If I had to pick a favorite, I'd probably go with Mahogany. All 3 are nice, but Mahogany is truly outstanding.

I would cut off the dead leaves. Good choices from my favorite online nursery for heucheras! Great job in preparing your bed and you've got a really great start. Please post some pictures when you (and your new additions) are ready:) Among the ones you ordered, I have Georgia Peach, Sweet Tea, Cajun Fire, and Berry Smoothie. They are in general very good and robust growers (not sure about Autumn leaves). They may get some sunburn during the first season if they are exposed to too much sun, particularly you are in a much warmer zone than my zone 5a. If you can, try to put sweet tea, southern comfort and autumn leaves under the dappled light. Canjun Fire and Georgia Peach tolerate sun the best. Similar to hostas, morning sun is more friendly than the afternoon suns. I agree with Sherry. Heucheras don't need much attention. Just give them some water during the first few weeks, then on hot and dry days, they should be fine.

Monstera do well in soils that hold moisture but also drain well. It's not unusual for a nursery to water their plants several times daily, so don't water it again until it's gone relatively dry. If it seems that the soil takes a long time to dry out, it may need repotting, which you can do later in spring (or just make the mess indoors; I prefer to do it outside). If you do, repot in any good potting soil with some Perlite added. Half might be a bit much, but it does depend on the potting soil. Very heavy soils might need half. Lighter ones, a quarter or less. Some soils might be fine as-is. For Monstera, don't pot in a large bark particle soil. They don't like soils that light and airy, and prefer soils that retain more water than that. Bark fines are not an issue. New plants seem to always arrive with shipping and transportation stress, so I wouldn't think too much of a few brown spots off the bat. For right now, give it proper light and care, and see where it goes from there. You can expect some marks to show up over the first week or two just from being brought home, too.

My Sans generally do better when they are cramped, not to the point of becoming totally root bound, but pleasantly cramped. A Sans that grows via rhizomes can easily break a plastic growers pot, just split it on the side. So -- you don't HAVE TO repot right now. Also, winter isn't the best season to do so. But you may want to give your Sans a repot in the spring when growing season begins. Just make sure to use a pot with sufficient drainage holes (I always prefer more than one), a gritty and fast-draining kind of mix (I add perlite AND pumice, or pumice and chicken grit, to C/S soil), and consider using a plastic pot so the Sans can break through it in the future.