You should check out your local fish stores to see what plants they offer, write them down and come home and research their light/water/fertilizer/CO2 requirements. Petstores sometimes have a small book near the fish tanks, about aquarium plants, you can look up the plants you see in the store with it and get compatible plants. I personally think grass gets ugly in a tank and needs lots of mowing, I would do baby tears as a ground cover because they don't require lots of trimming and are easier to acquire. I would plant your taller background plants first and work forward so you can see the composition. When you're putting the water back in the tank, go ahead and do your weekly water change and add the new water 25-50%. You'll have to recycle the tank anyways because you're going to be cleaning the tank which will remove all that good bacteria, your fish will need to stay in the other tank for up to 8 weeks for it to cycle except for the sacrificial fish to start the cycle, unless you want to do a fishless cycle with pure ammonia. Plants like fertilizer (but some will be dangerous for you invertebrates (copper chemicals)). You should plant with water in the tank cause when you add the water after you're likely to disturbed the substrate no matter how careful you are and mess up all your hard planting efforts.