The only reason I knew about him was through my friend, who was crushing hard on him. She had it really bad for some reason, but I didn't really pay much attention, since that was typical for her. It followed through high school, when the two were on and off again. She talked about him, complaining to me when I when to visit, and I ended ripping his baby picture! That was a little insane, but I thought he was probably a jerk, since I only cared about hearing her side of the story.
I know, I know, at sixteen, how can you know? But I knew from the first kiss he was it. I also know how cliché this sounds from that "first kiss" I knew. He was just different, he cared about not only how I felt, but how I experienced things with him. He didn't have much money, as we were both focusing on just finishing high school but he made the most out of our days together. My mother always said "marry the man who will climb mountains for you," well this guy had no car so he biked thirteen miles to my house twice a day for seven days just to spend maybe three hours with me. Was he it? He went from helping me clean my childhood room to being the only person who wanted to stick around.
First thing is you don’t have to know everything. In fact, learning is half the fun. If it’s both you and your partner’s first time then take time with it. You aren’t meant to be all ‘wham bam, you’re welcome ma’am.’ I know this isn’t much comfort but it’s the best advice anyone could give you.