Making sprites is very dificult... but not is impossible ^ ^
Before trying to make sprites, to edit some: Like recolours, Copy & Paste, etc...
Recolours: Easy! Go to paint with the sprite ya want to change the colours, make a 6x Zoom and use the pallete to change the colours! Remeber: Darker parts, darker colors.
Copy & Paste: Use the selection tool from paint to pick a part of a sprite and put it on another. Use the eraser to help with that ^ ^
Hope this helps ^ ^