I just want to caveat this by saying there are many ways to do this and people will have different opinions about it and water changes etc. But, you can setup your soil and hardscape first, take your time with it if you want and really get it the way you like it. Then when you have your plants and you're ready to go, plant them right into your dry tank. I personally think it's easier to plant into soil that's been sprayed down a bit with some water so it grips the plants a bit better. Tweezers are very helpful when doing this, and you should plant them fairly deep for their size, about an inch if you have enough plant height to work with so that when you do fill your water they have a better chance at staying put. Check the plant however, some plants actually shouldn't be planted and instead be attached to rock or wood. While you're planting, it's a good idea to be spraying the plants down occasionally so they don't wither. If you have tall stem plants, actually planting them after the water has filled up can make it easier to judge their position. Then you can fill it up, very slowly! You can put some filter floss down on the substrate and push a hose outlet into it to fill it up. I just use plastic bag and lay it down like a rug over the substrate, and then pour a couple cups of water directly onto the bag until there's a few inches, then I take a bucket or hose and continue carefully pouring it on that bag. The whole point of the filter floss or bag (or even your hand) is that you dissipate the force of the water going into the tank so you don't mess up your substrate and all the planting work you just did. Then at this point, you can cycle your tank with the plants in. They will actually help the cycle somewhat, but it's also a good period of time to let your plants adjust to growing in water if they weren't already. During this period you may want to do more frequent water changes. If you're using aquasoil, it can leach out a lot of amonia during the first few weeks, and that can hurt some of the plants. People suggest doing daily water changes the first week, then every other day the second week, then 2-3 times a week on week 3, then 1 a week after that. If you're not using aquasoil you can probably go a little easier on the changes so the bacteria has an easier time growing. Can you share a link to the Whisper 350?