Keep your lights adequate (not too high...not too low) for now. Once you get your co2 set up then you can start pumping the wattage in there.
I would take two initial measurements: 1. from your tap for nitrate, phosphate and kH 2. from your tank the same parameters.
IMO/IME no need to add too much now until you get your co2 started. Patience my friend.
Also, the key for EI is to make sure you have enough plants in there!!