First of all you must have a definite plan of what you are going to draw.
step 1 ; take a rough sheet of paper and draw what you want.if it is good then its ok and if you want any alterations then you can make the changes.
step 2 ; copy the picture in the main sheet . note ; try to draw as much as light as possible. because It would be easy for you to erase.
step 3 ; then colour using coour pencils.
tips for colouring;
while colouring a flower first fill the flower with yellow or any light colour.then shade from the edge with dark pencil like violet . then smudge in the middle of the flower. it would create a 3d effect.
avoid using crayons.it may spoil your picture.
colour you flower horizontal or vertical. avoid colouring both sides.
hope I helped u
plssssssssssssss mark as the best