Need help with player movement in an game i'm making

ok i'm using vb2008 express to make a game. it is a simple version of the fire emblem games. what i'm have trouble with is how to find where a person can move. currently i have a 14 by 6 "grid" which is just picture boxes beside each other. i put characters faces in the picture box to show they are there. when i click on the picture box with there face in it i want the available spots they can move to become blue. then when you click on one of those spots they move there.

just want to say also that i'm new to coding and dont know much although i have completed a basic programming course (in high school)

any help would be great with this and if i have been unclear just ask what i mean and i'll try to be clearer