I know nothing

[jennyjs]

I am new here and new to orchids, I know nothing about them. I bought a orchid from lowes on the discount rack, its flower stem was broken so I cut it off just below the break and repotted it in a larger pot with some orchid soil medium I got from the same place. The medium just seems to be bark and charcoal, and the tag for the plant calls it a mini-oncidium and calls for meduim light. I know nothing about the plant and would like to learn so anything you can tell me would be great like how to water, if the soil is correct, and I would like to know more about fertilization as I have never had a plant I really had to that for before.