There will be two extremely important items that without them nothing suitable can be accomplished. you must have a straight edge and lots of yellow coloring. He is basicalyy a combination of rectangles with a few curved lines used to designate secondary characteristics. likewise although several colors are part of the bob he must be yellow its in the song.
Be a keen observer. keep a nearby pic for reference. For his body, make a box. Add extras-close, round, big eyes, bulbous nose, tie & pants, stickarms & legs. Ah-ha-ha-ha-ha-ha.
Start with a square, make a second square behind the first but slightly to the right. Connect the square corners to each other. There you have a cube or a SPONGE! Simply draw in the other aspects associated with Spongebob and there you go, you have your very own Spongebob Squarepants.
Start with drawing a rectangular box. Draw the outline first, LIGHTLY, then fill in the details, pressing harder with your pencil as you go. You should refer to a reference.