How does the matchmaking work?

So I just started playing this game a few days ago, I did some games against the computer and then played a few with my friend against the computer and also real people. We did okay I guess, like I didn't, but we managed to win a few and it was pretty fun. Now every time I queue, however, it seems like everyone on both teams knows everything about every champion and all the items and stuff, and I... do not know any of that lol. Did playing with my friend move me into a higher bracket or something? His rank was 44 and mine was like 10 I think at the time. I seem to lose every game which is okay, learning experience and all, but I'm not sure how much I'm going to learn getting one shot by people who already know the game really well. Should I make a new account? Or would that be against the rules? Thanks in advance! Edit: I tried googling it but I wasn't able to find anything, sorry if this has been asked 70 times before.
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