Flourish does the whole range of fertilisers, but they are pricey; you can get N,P,K, and Iron all separately, and then trace (comprehensive) and excel. The link at the start of the thread is a good place to get the dry ferts, you can either add them to your tank dry, or mix into a solution. Iron chelate is what you get for the Iron macro.
Obstacle, give your plants a while (a week or two) to realise what's going on with all the new ferts/lights/CO2. After they're used to what's going on they will start going nuts and pearl every day. A drop checker is a handy tool to see what your CO2 levels are, and are cheap as chips off ebay. I wouldn't add the excel yet, you could maybe add it in a couple of weeks if you don't see any difference in growth rates