Whoa buddy slow down lol. Im not saying the person is wrong but dont just go and buy the first thing someone suggests. Stick with one thing and dont get tripped up. Soil is more forgiving and is generally the way to go for beginners, if you fuck up in coco, the screw ups will show fast and hard. Start with one plant, with the light that you have, its not the best but it will do. Go with simple nutes, three part is the most you really want to go as more on top of that just gets confusing.
Take your time, make sure every decision you make feels right and that you researched it pretty well. Dont just take the first bit of advice and run with it, research other sources.