how can i fix my hull on a microplus 501 explorer?

i have just got a fibreglass microplus explorer,and on the hull there is small crack come hole(about an inch and a quaurter long),i think it has been caused by the support rubber on the trailer its on. i do not have alot of money so i have to repair it myself,and obviously its on a boat so i must do a good job. i feel comfortable with the thought of using fibreglass,i would just like to know how to do it along with any other tips that u think might help me,thanks