Will you need to get you lighting system first. what you have is fine in the line of plants for the 18watt bulb... if you stay with that light you will need to stay in the low light plants... you gravel is fine for what your doing, you could just add fert tabs to the roots system and add liquid ferts. If you want you could layer your exsisting gravel or a plant sub a save a few dollars but still give yourself 4 inchies of sub. As far as CO2 system red seas yeast system that less of a mess than the DIY systems. I won't do anything until you get the lighting taken care of, no ned to add CO2 yeast system until you have a heavy load in the tank, for now seachem excel will put enough Co2 into the water if you start to use liquid ferts. 29 gal is a good tank to start a planted tank with.

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