One of the most often-repeated bits of advice concerning art supplies is, "Buy the best you can afford." But, that's hard to do when you haven't tried something in the studio.
You mentioned amazon, so, maybe return there and read reviews. Don't worry about stars; just read the most recent reviews by people who actually bought the product. That won't resolve the dilemma, but will give a much better chance of buying something you'll like.
That said, perhaps consider buying a decent set of watercolors, a few brushes, and some good paper. Markers are nice, but don't provide a very satisfying experience of mixing your own colors in the viscosity you like. There's no way to "up" brightness or saturation, and other ways of exploring the medium. Just a suggestion.