Nope, plants don't require an adjustment period.
The cabomba and Rotala are 'stem plants', so they may or may not have roots when you get them.
Just strip the lower 2 sets of leaves and burry them in the gravel. How to plant stem plants
. A Graphic by Redchigh. :)
Sorry for the rough image, but it might help give you an idea. Hmm, img tag isn't working, just click the link.
Definately dose the tank with Flourish (comprehensive supplement) and I personally use 2 10W CFLs (6500k cool white) in an incandescent hood over my 10Gs.
If you have a flourescent hood (with tubes) then get whatever will fit your hood, and make it 6500k (often called 'cool white' or 'daylight', but look for the 6500k. No need for fancy grow lights, just get the bulbs from wal-mart.)