The sketch is the beginning of any artwork for me, even if it is just to work out the colours to use. A pad and a pencil is the most basic equipment you can carry to create an idea, you probably have one of each lying around. Colour can be added with numerous mediums including colour pencils. Creating art needn't be expensive.
Normally these would be 'private' but I want people to see how some are 'not right', even on the ones that were not thrown away. Skill comes with practice - practice begins with a start.
Start with something you can draw, lines and curves; you could be surprised with what can be drawn with just lines and curves.
Give it a go...