Do you prefer a hand-drawn look? Make your job easier by sketching your design in pen or pencil first. Using the drawing tools in a vector program can be difficult if you don't have experience or don't have a tablet.
Instead, polish up your handmade sketch as much as possible. Once you're satisfied, scan the image and upload it as a background layer in your vector project. With your original drawing as a guide, it's easier to trace the correct path using the program's pen tool.