um ok first lets sort out the cycle as its really important :P
whatever you do, DONT add any fish straight away, plant the tank first. also if you can afford it, get nitrite/nitrate/ammonia test kits (liquid ones)...they can be really expensive, but its worth it. and a liquid ph test kit if u dont already have one. it will save a lot of trips to the store :P
i think you should start off with a few small hardy fish, so that if the plants dont use up all the ammonia and nitrate (nitrite will still be a problem) you aren't going to be killing fish. lots of people reccomend platys, but you might want to check with someone to make sure that's ok because as i have already said, platys need harder water (some people refer to this as 'basic' water.)
you'll need to monitor the ammonia, nitrite and nitrate daily to see what is happening. plants use ammonia and nitrate as food and can help control nitrate in a cycled tank. when the tank is cycling they will use up the ammonia. nitrite is still there at some point in the cycle, so regular water changes are essential to reduce that as well as other toxins. i'd say maybe a water change every second day during cycling? it sounds excessive but it's probably a good idea.
whatever the case, only once there are readings of 0 for ammonia and nitrite and hopefully not too much nitrate (in a planted tank there may even be none), should you add fish. i've never kept dwarf gouramis before so i don't know much about how hardy they are, but i'm pretty sure they've got to be hardier than corys, so maybe add one of those first.
and definitely only get one. or disaster will ensue
sorry for long post! and sorry to fish experts if any of that cycling info is incorrect!