Using very light pencil strokes, begin by drawing a framework of lines, ovals, and circles. Creating a stick figure to pose your character is a good idea and it can help keep a loose, natural feel to your illustration. Teach yourself to start with basic shapes. Everything you see can be broken down into simple shapes such as squares, triangles, rectangles, etc.
Now that a framework of basic shapes is in place, begin your character's silhouette. Again, use light pencil strokes so that you can easily erase and redraw your lines if necessary. A silhouette can be a quick outline, there's no need to add a ton of details yet. Just imagine where the sides of the character's arms are, where the edges of his belt might be, where his hair pokes out.
Now it's time to start fleshing out your character. Using the framework and the silhouette that you've laid down with light pencil strokes, you can start adding in the details of Boba's shirt, belt, shoes, hair, etc. Feel free to use slightly heavier lines during this step, but always keep in mind that if something looks wrong, you can just erase it and try again. Practice makes perfect!
Once you're happy with how his outfit and other details look, you can draw his face and his hands. Fingers are tricky, so pay extra attention to them. Sometimes it can even be helpful to look at your own hands while drawing, or to hold them up to a mirror for reference. Spend extra time on Boba's facial expression and eyes, too.
Go over your existing lines from Steps 3 and 4 with darker, bolder pencil lines, or go over it with ink (a pen, marker, etc.) for a nice finished look. From this point on, you can add as much or as little as you like. Some people like to add some shading with their pencil. Some people like to add some color with colored pencils or markers. It's completely up to you!
Here's the final version of young Boba Fett, colored with Photoshop, but you can also color in your drawing with paint or colored markers.