Given your geographic location, I would recommend an above-ground bog (i.e. -- large pot or tub), rather than an in-ground bog. You can do an in-ground bog, but except for S. purpurea ssp. purpurea (pref. Canadian in origin), you'd probably have to dig up your plants before freezing, and keep them in the fridge over winter.
For an above-ground bog, I'd recommend a 2-foot pot, the kind that looks like stone, but is actually foam. They are sturdy and lightweight, and you can drill drainage holes in them.
Drill 4 quarter-inch holes, spaced equally around the rim, about 1.5 - 2 inches below the top of the pot. This helps prevent flooding if it pours.
VFTs and Sarracenia really do best, IMHO, in pure LFS moss. It's more expensive than peat, so I recommend filling the bottom half of the pot with wet peat, then fill the pot, to within an inch of the rim, with wet LFS moss.
Water thoroughly, shake gently to remove air bubbles, and let settle for 2 weeks. If necessary, add more LFS to top pot off again.
In a 2-foot pot, you should be able to plant 3 Sarracenia, leaving them room to grow for years to come, or 6-8 smaller Sarracenia, and replant them in a year or two into more pots. You can then plant the VFTs amid the bases of the Sarracenia.
Non-sphagnous mosses tend not to grow as readily on long-fiber sphagnum (LFS) as they do on peat, and often, LFS has living sphagnum that will grow eventually.