I can offer a little bit of advice. If you’re using coloured pencils, a lot of that jazz is layering. Throw down a layer of a colour, then go over the whole drawing again with another colour, then repeat… and repeat… and go nuts.
Experiment later with the same colour but lighter or darker versions to create shadows and highlights.
Have fun with it!
Art is a lot of experimentation and finding what works for you and what you like.
Also let nobody tells you that your art is crap.
Not only did you just start out, but every artist is a work in progress all you can do is get better at what you are doing.