One of the easiest ways to start selecting colors is to try a monochromatic pallet. This means the base color is the same and you add shades, tones and tints to that base color. This is a great way to explore your favorite color by simply adding different shades of the same color. Here's an example of a monochromatic blue pallet using the base color of blue (my personal fave).
It includes aquamarine, blue zircon, sapphire, light sapphire. And I threw in some capri blue and turquoise for a little pop. Monochromatic color pallets are very calming and feel peaceful when wearing them.