For those plants (like anubias or ferns) attached to drift/bog wood, you can probably keep them in the bags for 1-2 days, maybe mist them a few times a day to keep the leaves moist.... but what i usually do is just directly transfer them into a large bucket or container of water. You'll need to clean and quarantine them for a few days anyways, make sure there are no unwanted hitchhikers (ie. snails, worms, bugs or algae) before you introduce them to your tank.
Usually if the plants are attached to wood pieces, they are meant to be attached that way, not planted into the substrate.
The moss sheets sold at LFS are basically cultivated in tubs so they come in flat dense pieces, you'll have to separate them and then tie to wood pieces, mesh or stones. Don't just lay them directly on the substrate 'cos once you fill the tank with water they will start floating around and create a big mess.
Getting drift wood with plants or moss already growing on them can be a good idea (if its done in a layout that you like). Alternatively you could also do it yourself, it'll just take some time for the plants (especially moss) to attach themselves to the wood.
If you are planning to use Co2 to speed up plant growth, then you'll also need to have high lighting and additional fertilization to balance the tank parameters... once you start in that sort of setup, then it'll not be low tech anymore, it'll be best to just go high tech all the way.
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