If i don't know what to draw how do i get idea?

You can get ideas in various ways, such as the Internet, thinking about what your favorite things/topics are, or you can just let ideas come into your head naturally!

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.