@Tamara2000,
I remember being your age.
I think you're doing fine. At his age, a lot of guys don't initiate conversation that much. So you might be asking some questions. Such as, what is he doing
after school and on the weekends these days? If he's playing sports, or playing music, or making art, those are all great things to talk about and ask about. You can also reminisce about camp and maybe even talk about what you've done since then that is like what you did in camp. Did you go to different camps? Did you start gardens?
Does he have brothers and sisters, other than the brother you met? Does he get along with them? Does he have funny stories about some times with them?
What about where he lives? Is it a city? A suburb? Farm land? How does he get around? Does he take a trolley or a bus or a train? Does he ride a bike? Does he walk a lot? Do his parents drive him around?
And the last perennial fallback topic of conversation is always school. What is taking now? What does he like? The school year (at least here in the US) will be done in about 6 - 8 weeks or so. What are his summer plans? What does he want to take next year?
And be patient. Contact with someone long distance doesn't always happen when we'd like it to. And recognize that he has a life outside of being in contact with you. He has school and homework, he may have chores around the house and, yes, he might have a girlfriend. So be prepared for that as a very real possibility. I know you might want to believe that he's free and he's just waiting for your texts, calls, emails, etc., but he might not be.
And have fun with it - and have a life outside of this contact, too. That means not just school and homework, but also spending time with your friends and maybe even boys. Understand that you might be idolizing him as you haven't seen him in years and your memories might be better than what the reality was. Guys in your town might not compare - but they are competing with what may be idealized memories. So give the guys in your area a break. You might find they're cooler than you think.