Make sure you research your competition to see what they are designing to get an idea.
Colour is very important when designing because it communicates a message to your audience. Colours can grab the attention of the viewer and brings your illustration to life.
Avoid using the same design aspect over and over. Here is a link to logo design cliches.
Keep your logo simple the best icons are usual simple and timeless including nike and apple.
Think about negative space in a clever way.
Also I am a Graphic Designer who specializes in Logo Design.