How to build a stronger relationship with my crush?

So me and this boy have been talking for less that a month. school is out for the summer and i really want to build a stronger relationship with him so i can make him my boyfriend! I really shy at first but i jus cant find a way to loosen up to him. i really wanna have a relationship with him. I know the main problem is communications. i dont talk as much and i have a hard time coming up with things to talk about. What should i talk about? What things should i do to make him fall for me. Btw he already likes me, i jus dont want him to loose intrest. please HELP! this is like the boy you set your eyes on and you automatically KNOW that you guys HAVE to be together! its only right!